All words, A to Z
Showing all 419 words.
A
- Abbreviation English
- A shorter way to write a word, like Dr for Doctor.
- Absorb Science
- To soak up or take in, the way a sponge takes in water.
- Acid Science
- A sour-tasting substance such as lemon juice. Strong acids can burn, so never taste unknown liquids.
- Acronym English
- A word made from the first letters of other words, like NASA or ISRO.
- Acute angle Maths
- An angle smaller than a right angle, which is less than 90 degrees.
- Adaptation Science
- A feature that helps a living thing survive where it lives, like a camel's thick eyelashes in the desert.
- Addition Maths
- Putting numbers together to find the total. The sign for it is +.
- Adjective English
- A word that describes a noun, like "red" in "a red ball".
- Adverb English
- A word that tells more about a verb, like how, when or where something happens: "she ran quickly".
- Air Science
- The mixture of gases around us. It is mostly nitrogen, with oxygen that we breathe.
- Algebra Maths
- A part of maths that uses letters to stand for numbers we do not know yet.
- Algorithm Computers
- A set of clear steps to solve a problem or do a job, like a recipe.
- Alkali Science
- A base that dissolves in water, such as soap. It feels slippery and tastes bitter.
- Alliteration English
- Using the same sound at the start of several words, like "big blue balloon".
- Alphabet English
- All the letters of a language in their order. English has 26 letters.
- Amphibian Science
- An animal such as a frog that starts life in water and can live on land as an adult.
- Angle Maths
- The amount of turn between two lines that meet at a point. We measure it in degrees.
- Antonym English
- A word that means the opposite of another word. Hot is the antonym of cold.
- Apostrophe English
- The mark ' used to show that letters are missing, as in "don't", or that something belongs to someone, as in "Ravi's bag".
- App Computers
- A program you use on a phone or tablet, short for application.
- Arc Maths
- A curved part of the edge of a circle.
- Area Maths
- The amount of flat space inside a shape. We measure it in square units such as square centimetres.
- Article English
- The small words "a", "an" and "the" that come before a noun.
- Artificial intelligence Computers
- Computer programs that can do things that normally need human thinking, such as recognising speech.
- Ascending order Maths
- Arranged from the smallest to the biggest, like 2, 5, 9, 14.
- Atmosphere Science
- The layer of air around the Earth.
- Atom Science
- A tiny building block of matter. Everything around us is made of atoms.
- Attachment Computers
- A file sent along with an email.
- Author English
- The person who writes a book, story or article.
- Autobiography English
- A book where a person tells the story of their own life.
- Average Maths
- One number that shows what is typical for a group. To find the mean, add all the numbers and divide by how many there are.
B
- Backup Computers
- An extra copy of your files kept safe in case the first copy is lost.
- Bacteria Science
- Tiny living things made of one cell. Some make us ill and many are helpful.
- Bar graph Maths
- A picture that uses bars of different heights or lengths to compare amounts.
- Base of a triangle Maths
- The side a triangle is thought of as standing on. The height is measured straight up from it.
- Battery Science
- A store of chemical energy that can push an electric current round a circuit.
- Binary Computers
- A way of writing numbers using only 0 and 1. Computers use it to store everything.
- Biodiversity Science
- The large number of different kinds of plants, animals and other living things in a place.
- Biography English
- A book about the life of a real person, written by someone else.
- Bit Computers
- The smallest piece of computer information, either a 0 or a 1.
- Boiling point Science
- The temperature at which a liquid bubbles and turns to gas. Water boils at 100 degrees Celsius at sea level.
- Bookmark Computers
- A saved link to a web page so you can find it again easily.
- Browser Computers
- A program for visiting websites, such as Chrome, Firefox or Safari.
- Bug Computers
- A mistake in a program that makes it do something wrong.
- Byte Computers
- A group of 8 bits. One byte can store one letter.
C
- Capacity Maths
- How much a container can hold, such as 2 litres of water.
- Capital letter English
- A big letter like A or B, used at the start of a sentence and for names.
- Caption English
- The short words under a picture that explain it.
- Carbon dioxide Science
- A gas that animals breathe out and plants use to make food.
- Carnivore Science
- An animal that eats only other animals, like a lion.
- Cell Science
- The tiny building block that all living things are made of.
- Centimetre Maths
- A small unit of length. There are 100 centimetres in 1 metre.
- Character English
- A person or animal in a story.
- Chlorophyll Science
- The green substance in leaves that catches sunlight so the plant can make food.
- Chord Maths
- A straight line that joins two points on a circle. The longest chord is the diameter.
- Circle Maths
- A perfectly round shape where every point on the edge is the same distance from the centre.
- Circuit Science
- A complete path that electric current can flow around.
- Circumference Maths
- The distance all the way around a circle, like its perimeter.
- Citation English
- A note that tells where you found a fact or a quote, such as the name of the book or website.
- Clause English
- A group of words with a subject and a verb. It can be a whole sentence or part of one.
- Climate Science
- The usual weather of a place over many years.
- Cloud storage Computers
- Keeping your files on computers on the internet, so you can open them from many devices.
- Code Computers
- The instructions written for a computer in a programming language.
- Coding Computers
- Writing instructions for a computer to follow.
- Colon English
- The mark : that comes before a list or an explanation.
- Comma English
- The mark , that gives a short pause in a sentence or separates items in a list.
- Command Computers
- An instruction you give to a computer.
- Compound word English
- A word made by joining two words, like "football" or "sunflower".
- Computer Computers
- A machine that follows instructions to take in information, work with it and show results.
- Condensation Science
- When a gas such as water vapour cools and turns into liquid drops.
- Conditional Computers
- A coding idea that says "if this is true, do that", like if it is raining, take an umbrella.
- Conductor Science
- A material that lets heat or electricity pass through it easily, like copper.
- Cone Maths
- A solid shape with a round flat base and one point at the top, like an ice-cream cone.
- Conjunction English
- A joining word such as "and", "but" or "because".
- Consonant English
- A letter that is not a vowel, like b, c, d or t.
- Consumer Science
- A living thing that cannot make its own food and eats plants or animals.
- Contraction English
- A shorter word made by joining two words and leaving out some letters, like "can't" for "cannot".
- Coordinates Maths
- A pair of numbers that tells you where a point is on a grid, like (3, 2).
- Copy and paste Computers
- Copying something and putting a duplicate of it somewhere else.
- CPU Computers
- The central processing unit, the part of the computer that does the thinking and calculating.
- Cube Maths
- A solid shape with six square faces that are all the same size, like a dice.
- Cube number Maths
- The answer when you multiply a number by itself three times. For example, 2 x 2 x 2 = 8, so 8 is a cube number.
- Cube root Maths
- The number that makes a cube number when multiplied by itself three times. The cube root of 27 is 3.
- Cuboid Maths
- A solid shape with six rectangle faces, like a brick or a matchbox.
- Current Science
- The flow of electric charge round a circuit.
- Cursor Computers
- The small mark on the screen that shows where you are typing or pointing.
- Cyberbullying Computers
- Being unkind to someone online or on a phone. If it happens, tell a trusted adult.
- Cylinder Maths
- A solid shape with two flat round ends and a curved side, like a tin of beans.
D
- Data Maths
- Facts and numbers that we collect, like how many children in a class like mango.
- Database Computers
- An organised collection of information that a computer can search quickly.
- Debug Computers
- To find and fix the mistakes in a program.
- Decimal Maths
- A number with a point in it, like 3.5, that shows parts smaller than one.
- Decomposer Science
- A living thing, such as a fungus, that breaks down dead plants and animals into the soil.
- Denominator Maths
- The bottom number of a fraction. It tells how many equal parts the whole is cut into.
- Density Science
- How much matter is packed into a space. Iron is denser than wood, so it sinks in water.
- Descending order Maths
- Arranged from the biggest to the smallest, like 20, 11, 7, 3.
- Desktop Computers
- The main screen you see when a computer starts, with its icons.
- Dialogue English
- The words that characters say to each other in a story.
- Diameter Maths
- A straight line across a circle through its centre. It is twice as long as the radius.
- Dictionary English
- A book or website that lists words in A to Z order and tells their meanings.
- Difference Maths
- The answer when you subtract one number from another. It tells how far apart two numbers are.
- Digestion Science
- How the body breaks food down into tiny parts it can use.
- Digit Maths
- One of the ten number symbols 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.
- Digital footprint Computers
- The trail of information about you that is left behind when you use the internet.
- Dividend Maths
- The number that is being divided. In 12 divided by 3, the dividend is 12.
- Division Maths
- Sharing a number into equal groups, or finding how many times one number fits into another. The sign is ÷.
- Divisor Maths
- The number you divide by. In 12 divided by 3, the divisor is 3.
- DNA Science
- The chemical inside cells that carries the instructions for how a living thing grows.
- Download Computers
- To copy a file from the internet onto your own device.
E
- Earthquake Science
- A shaking of the ground when big pieces of the Earth's crust move.
- Eclipse Science
- When one space object moves into the shadow of another, like the Moon passing in front of the Sun.
- Ecosystem Science
- All the living and non-living things in one place, and how they work together.
- Edge Maths
- A line where two faces of a solid shape meet.
- Electricity Science
- A form of energy from moving electric charge, which powers lights, fans and phones.
- Element Science
- A pure substance made of only one kind of atom, such as oxygen or iron.
- Email Computers
- A message sent through the internet from one person to another.
- Emoji Computers
- A small picture used in messages to show an idea or a feeling.
- Energy Science
- The ability to make things move or change. Light, heat and sound are forms of energy.
- Equation Maths
- A maths sentence with an equals sign, like 3 + 4 = 7, which says both sides have the same value.
- Equilateral triangle Maths
- A triangle with all three sides the same length and all three angles equal.
- Equivalent fractions Maths
- Different fractions that have the same value, like 1/2 and 2/4.
- Erosion Science
- The slow wearing away of rock and soil by water, wind or ice.
- Estimate Maths
- A careful guess that is close to the real answer, made by rounding the numbers.
- Evaporation Science
- When a liquid warms up and turns into a gas, like puddles drying in the sun.
- Even number Maths
- A whole number that can be shared into two equal groups with none left over, like 2, 4, 6 and 10.
- Exclamation mark English
- The mark ! that shows strong feeling or surprise.
- Exponent Maths
- A small raised number that tells how many times to multiply a number by itself. In 2 to the power 3, the exponent is 3.
F
- Fable English
- A short story with animals as characters that teaches a lesson.
- Face Maths
- A flat surface of a solid shape. A cube has six faces.
- Fact English
- Something that is true and can be checked.
- Factor Maths
- A number that divides another number exactly. The factors of 6 are 1, 2, 3 and 6.
- Fertiliser Science
- Something added to soil to help plants grow well.
- Fiction English
- Stories that are made up by the writer.
- File Computers
- A named piece of information saved on a computer, like a picture or a document.
- Firewall Computers
- A security tool that blocks unsafe connections between a computer and the internet.
- Flowchart Computers
- A drawing that shows the steps of a process using boxes and arrows.
- Folder Computers
- A place on a computer where you keep files together.
- Folktale English
- A traditional story told for many years and passed from person to person.
- Font Computers
- The style of the letters, such as bold or italic.
- Food chain Science
- A line that shows who eats whom, starting with a plant, like grass to deer to tiger.
- Force Science
- A push or a pull that can move, stop or change the shape of something.
- Fossil Science
- The remains or print of a plant or animal that lived long ago, kept in rock.
- Fraction Maths
- A part of a whole, written as one number over another, like 3/4.
- Friction Science
- The force that slows things down when they rub against each other.
- Fuel Science
- Something we burn to get heat or power, like petrol, wood or gas.
- Full stop English
- The dot . that ends a sentence.
- Function Computers
- A named group of instructions in a program that you can use again and again.
- Fungi Science
- Living things like mushrooms and yeast that are neither plants nor animals.
G
- Galaxy Science
- A giant group of billions of stars. Our Sun is in the Milky Way galaxy.
- Gas Science
- A state of matter with no fixed shape that spreads out to fill its container, like air.
- Gene Science
- A tiny piece of DNA that carries one instruction for how a living thing looks or works.
- Genre English
- A kind of writing, such as mystery, fantasy or poetry.
- Geometry Maths
- The part of maths about shapes, lines, angles and space.
- Germination Science
- When a seed starts to grow into a small plant.
- Glossary English
- A small list of hard words with their meanings, often at the back of a book.
- Grammar English
- The rules for how words are put together to make sentences.
- Graph Maths
- A picture that shows numbers or facts so they are easy to compare.
- Gravity Science
- The pull between objects. It is why things fall down towards the Earth.
- Greater than Maths
- Bigger than. The sign is >, so 9 > 5 means nine is greater than five.
H
- Habitat Science
- The natural home of a plant or animal, like a pond or a forest.
- Hard disk Computers
- A part inside a computer that stores files even when the power is switched off.
- Hardware Computers
- The parts of a computer that you can touch, like the keyboard and screen.
- Heading English
- A title at the top of a piece of writing or a section.
- Heart Science
- The muscle that pumps blood around the body.
- Herbivore Science
- An animal that eats only plants, like a cow.
- Hexagon Maths
- A flat shape with six straight sides.
- Homophone English
- A word that sounds the same as another word but has a different meaning or spelling, like "see" and "sea".
- Horizontal Maths
- Flat and level, going left to right like the horizon.
- Hyphen English
- A short line - used to join words or parts of words, like in "well-known".
- Hypotenuse Maths
- The longest side of a right-angled triangle, opposite the right angle.
I
- Icon Computers
- A small picture on a screen that stands for a program, a file or a command.
- Idiom English
- A saying whose meaning is not the same as its words, like "it is raining cats and dogs".
- Improper fraction Maths
- A fraction whose top number is bigger than or equal to its bottom number, like 7/4.
- Index English
- A list at the back of a book that tells you which page to find a topic on.
- Input Computers
- Information that goes into a computer, for example by typing on a keyboard.
- Insect Science
- A small animal with six legs and three body parts, like an ant or a bee.
- Insulator Science
- A material that does not let heat or electricity pass easily, like rubber or plastic.
- Integer Maths
- A whole number that can be positive, negative or zero, like -3, 0 and 8.
- Interjection English
- A word that shows sudden feeling, like "wow" or "ouch".
- Internet Computers
- A giant network that connects computers around the world so they can share information.
- Invertebrate Science
- An animal with no backbone, such as a worm, a snail or a spider.
- Isosceles triangle Maths
- A triangle with two sides the same length and two angles equal.
J
- Joule Science
- The unit we use to measure energy.
K
- Keyboard Computers
- A set of keys you press to type letters and numbers into a computer.
- Kilogram Maths
- A unit for weighing things. There are 1000 grams in 1 kilogram.
- Kilometre Maths
- A unit for long distances. There are 1000 metres in 1 kilometre.
- Kinetic energy Science
- The energy something has because it is moving.
L
- Legend English
- An old story about heroes or events that may be partly true.
- Lens Science
- A curved piece of glass or plastic that bends light, used in glasses and cameras.
- Less than Maths
- Smaller than. The sign is <, so 3 < 8 means three is less than eight.
- Light Science
- A kind of energy that lets us see. It travels very fast in straight lines.
- Line of symmetry Maths
- A line that cuts a shape into two halves that match exactly, like a mirror.
- Link Computers
- Words or a picture you can click to jump to another web page. It is also called a hyperlink.
- Liquid Science
- A state of matter that flows and takes the shape of its container, like water.
- Litre Maths
- A unit for measuring liquids. A big bottle of water is often 1 litre.
- Login Computers
- Entering your username and password to get into an account.
- Loop Computers
- A part of a program that repeats the same steps again and again.
- Lungs Science
- The two organs in the chest that take in oxygen when we breathe.
M
- Magnet Science
- An object that pulls iron and some other metals towards it.
- Magnetic field Science
- The space around a magnet where its pull can be felt.
- Malware Computers
- Harmful software made to damage a computer or steal information.
- Mammal Science
- An animal with hair or fur that feeds its babies milk, like a dog or a human.
- Mass Science
- The amount of matter in an object. We measure it in kilograms.
- Mean Maths
- The average found by adding all the numbers and dividing by how many numbers there are.
- Median Maths
- The middle number when all the numbers are put in order.
- Melting point Science
- The temperature at which a solid turns into a liquid. Ice melts at 0 degrees Celsius.
- Memory Computers
- The part of a computer where it keeps information it is working on right now.
- Menu Computers
- A list of choices on a screen, such as File or Edit.
- Metal Science
- A hard, shiny material that carries heat and electricity well, like iron or copper.
- Metaphor English
- Saying something is something else to make a picture in the mind, like "the classroom was a zoo".
- Metre Maths
- A unit of length. A big step is about one metre.
- Microscope Science
- A tool with lenses that makes tiny things look much bigger.
- Migration Science
- When animals travel a long way at a certain time of year to find food or a warmer place.
- Mineral Science
- A natural solid substance found in rocks and the ground. Our bodies also need some in food.
- Minus Maths
- Take away. The sign for it is -.
- Mixed number Maths
- A whole number and a fraction together, like 2 and 1/2.
- Mixture Science
- Two or more things mixed together that are not joined chemically, like sand and water.
- Mode Maths
- The number that appears most often in a list.
- Molecule Science
- Two or more atoms joined together. A water molecule has two hydrogen atoms and one oxygen atom.
- Monitor Computers
- The screen of a computer that shows what the computer is doing.
- Moon Science
- A natural object that goes round a planet. Earth's Moon shines because it reflects sunlight.
- Motherboard Computers
- The main circuit board inside a computer that connects all the other parts.
- Mouse Computers
- A tool you move to point at things on the screen and click.
- Multiple Maths
- A number you get by multiplying a number by 1, 2, 3 and so on. The multiples of 4 are 4, 8, 12 and 16.
- Multiplication Maths
- Adding the same number again and again in a quick way. 4 x 3 means 3 groups of 4, which is 12.
- Myth English
- An old story that explains something about the world, often about gods or heroes.
N
- Narrator English
- The voice that tells a story.
- Negative number Maths
- A number less than zero, written with a minus sign, like -5.
- Network Computers
- Computers and devices that are connected so they can share information.
- Neuron Science
- A nerve cell that carries messages between the brain and the body.
- Non-fiction English
- Writing about real things and real facts.
- Noun English
- A word for a person, place, animal or thing, like "teacher", "Delhi" or "book".
- Nucleus Science
- The control centre of a cell. The nucleus is also the tiny centre of an atom.
- Number line Maths
- A straight line with numbers in order, used to count, add and compare.
- Numerator Maths
- The top number of a fraction. It tells how many parts we are talking about.
- Nutrient Science
- A part of food that the body needs to grow and stay healthy, like protein or vitamins.
O
- Object English
- The part of a sentence that receives the action. In "Maya kicked the ball", the ball is the object.
- Obtuse angle Maths
- An angle bigger than a right angle but smaller than a straight line, between 90 and 180 degrees.
- Octagon Maths
- A flat shape with eight straight sides, like a stop sign.
- Odd number Maths
- A whole number that leaves one over when shared into two equal groups, like 1, 3, 5 and 9.
- Omnivore Science
- An animal that eats both plants and animals, like a bear or a human.
- Online Computers
- Connected to the internet.
- Onomatopoeia English
- A word that sounds like the noise it names, like "buzz" or "splash".
- Operating system Computers
- The main software that runs a computer and lets other programs work, such as Windows or Android.
- Opinion English
- What someone thinks or feels. It is not a fact because people can disagree.
- Orbit Science
- The curved path of one object going round another, like Earth round the Sun.
- Organ Science
- A part of the body with a special job, like the heart or the stomach.
- Organism Science
- Any living thing, such as a plant, an animal or a fungus.
- Origin Maths
- The point (0, 0) on a graph where the two axes cross.
- Output Computers
- Information that comes out of a computer, like words on a screen or sound from speakers.
- Oxygen Science
- A gas in the air that living things need to breathe.
P
- Paragraph English
- A group of sentences about one idea. It usually starts on a new line.
- Parallel lines Maths
- Lines that always stay the same distance apart and never meet, like railway tracks.
- Parallelogram Maths
- A four-sided shape with two pairs of parallel sides.
- Password Computers
- A secret word or phrase that protects your account. Never share it, except with a parent or guardian.
- Pentagon Maths
- A flat shape with five straight sides.
- Percentage Maths
- A number out of 100. 50 percent means 50 out of every 100, which is half.
- Perimeter Maths
- The distance all the way around the edge of a flat shape.
- Perpendicular Maths
- Meeting another line at a right angle, like the corner of a book.
- Personification English
- Giving human feelings or actions to things that are not human, like "the wind whispered".
- Phishing Computers
- A trick where someone pretends to be a trusted person or company to steal your information.
- Photosynthesis Science
- How green plants use sunlight, water and carbon dioxide to make their own food and give out oxygen.
- Pi Maths
- The number you get when you divide the circumference of any circle by its diameter. It is about 3.14.
- Pictograph Maths
- A graph that uses little pictures to show amounts.
- Pie chart Maths
- A circle cut into slices to show how a whole is shared among parts.
- Pixel Computers
- One tiny dot of colour. Pictures on a screen are made from thousands of pixels.
- Place value Maths
- The value of a digit because of where it sits in a number. In 352, the 5 stands for 50.
- Plagiarism English
- Copying someone else's words or work and saying it is yours.
- Planet Science
- A large round object that goes round a star. Earth is a planet.
- Plot English
- What happens in a story, from the beginning to the end.
- Plural English
- More than one. The plural of "book" is "books".
- Poem English
- A piece of writing that uses rhythm, and often rhyme, to share feelings or ideas.
- Pointer Computers
- The arrow on the screen that moves when you move the mouse.
- Pollination Science
- Moving pollen from one flower to another so that seeds can form.
- Pollution Science
- Dirt or harmful things in the air, water or soil.
- Polygon Maths
- A flat shape with straight sides that is closed all the way round, like a triangle or a hexagon.
- Pop-up Computers
- A small window that suddenly appears on a screen, often an advert. Do not click on unknown ones.
- Predator Science
- An animal that hunts and eats other animals.
- Predicate English
- The part of a sentence that tells what the subject does or is.
- Prefix English
- Letters added to the start of a word to change its meaning, like "un" in "unhappy".
- Preposition English
- A word that shows position or direction, like "on", "under" or "to".
- Pressure Science
- How hard a force pushes on a certain area.
- Prey Science
- An animal that is hunted and eaten by another animal.
- Prime number Maths
- A number bigger than 1 that can only be divided exactly by 1 and itself, like 2, 3, 5, 7 and 11.
- Printer Computers
- A machine that puts words or pictures from a computer onto paper.
- Probability Maths
- How likely it is that something will happen, from impossible to certain.
- Producer Science
- A living thing, like a plant, that makes its own food.
- Product Maths
- The answer you get when you multiply numbers. The product of 6 and 7 is 42.
- Program Computers
- A set of instructions that tells a computer what to do.
- Programming language Computers
- A special language used to write instructions for computers, such as Python or Scratch.
- Pronoun English
- A word that takes the place of a noun, like "he", "she", "it" or "they".
- Proper noun English
- The special name of a person, place or thing, which starts with a capital letter, like Asha or India.
- Proverb English
- A short wise saying, like "a stitch in time saves nine".
- Punctuation English
- Marks such as full stops and commas that make writing clear.
- Pupil Science
- The black circle in the middle of the eye that lets light in.
- Pythagoras theorem Maths
- In a right-angled triangle, the square on the longest side equals the sum of the squares on the other two sides.
Q
- Quadrilateral Maths
- Any flat shape with four straight sides, such as a square or a kite.
- Question mark English
- The mark ? that comes at the end of a question.
- Quotation marks English
- The marks " " put around the exact words someone says or the words copied from a source.
- Quotient Maths
- The answer you get when you divide one number by another. In 12 divided by 3, the quotient is 4.
R
- Radius Maths
- The distance from the centre of a circle to its edge. It is half the diameter.
- RAM Computers
- A type of computer memory that holds the things you are working on right now. It empties when the power goes off.
- Ratio Maths
- A way of comparing two amounts. If there are 2 boys for every 3 girls, the ratio is 2 to 3.
- Reciprocal Maths
- The number you get by flipping a fraction upside down. The reciprocal of 2/3 is 3/2.
- Rectangle Maths
- A four-sided shape with four right angles, where opposite sides are the same length.
- Recycle Science
- To turn used things like paper or glass into new things instead of throwing them away.
- Reflection Science
- When light or sound bounces off a surface, like your face in a mirror.
- Reflex angle Maths
- An angle bigger than a straight line but smaller than a full turn, between 180 and 360 degrees.
- Refraction Science
- The bending of light as it passes from one material into another, like a straw looking bent in water.
- Remainder Maths
- What is left over when a number cannot be divided exactly. 13 divided by 4 is 3 with a remainder of 1.
- Renewable energy Science
- Energy from sources that do not run out, like sunlight, wind and flowing water.
- Reptile Science
- A cold-blooded animal with dry scaly skin, like a snake or a lizard.
- Resistance Science
- How much a material pushes back against an electric current.
- Respiration Science
- How living things use oxygen to release energy from food.
- Rhombus Maths
- A four-sided shape with all four sides the same length, like a diamond.
- Rhyme English
- When words end with the same sound, like "cat" and "hat".
- Rhythm English
- The beat of the words in a poem or song.
- Riddle English
- A puzzle in words that asks you to guess the answer.
- Right angle Maths
- An angle of exactly 90 degrees, like the corner of a page.
- Robot Computers
- A machine that can sense things and be programmed to do tasks.
- Rock Science
- A hard natural material that makes up the Earth's crust.
- Root word English
- The basic word that other words are built from. "Play" is the root of "playful" and "replay".
- Rotation Science
- Turning around a centre. The Earth rotates once about every 24 hours, giving us day and night.
- Rounding Maths
- Changing a number to a nearby one that is easier to use, like 47 to 50.
- Router Computers
- A device that sends internet signals to the computers and phones in your home.
S
- Scalene triangle Maths
- A triangle where all three sides are different lengths.
- Scanner Computers
- A machine that copies a picture or page from paper into a computer.
- Screenshot Computers
- A picture of what is on your screen.
- Search engine Computers
- A website that helps you find things on the internet, like Google or Bing.
- Sector Maths
- A slice of a circle, like a piece of pizza.
- Sensor Computers
- A part that notices something in the world, like light, heat or movement, and tells the computer.
- Sentence English
- A group of words that makes complete sense. It starts with a capital letter and ends with a full stop, question mark or exclamation mark.
- Sequence Computers
- Steps done in a certain order, one after the other.
- Server Computers
- A powerful computer that stores websites and files and sends them to other computers.
- Setting English
- Where and when a story takes place.
- Simile English
- A comparison using "like" or "as", such as "as brave as a lion".
- Singular English
- Just one. "Book" is singular.
- Skeleton Science
- The frame of bones that holds up the body and protects its organs.
- Software Computers
- Programs and apps that tell a computer what to do. You cannot touch software.
- Soil Science
- The top layer of the ground where plants grow, made of tiny bits of rock and rotted plants.
- Solar system Science
- The Sun and everything that goes round it, including the eight planets.
- Solid Science
- A state of matter that keeps its own shape, like a stone.
- Solution Science
- A liquid with something dissolved in it, like salt in water.
- Sound Science
- Something we hear, made when things vibrate and send waves through the air.
- Source English
- A person, book or website where you get information.
- Spam Computers
- Unwanted messages, often adverts, sent to many people.
- Speed Science
- How fast something is moving, such as 60 kilometres in one hour.
- Spelling English
- The correct order of letters in a word.
- Sphere Maths
- A perfectly round solid shape, like a ball.
- Sprite Computers
- A character or object that you can move and control in a program like Scratch.
- Square Maths
- A shape with four equal sides and four right angles.
- Square number Maths
- The answer when you multiply a number by itself. 5 x 5 = 25, so 25 is a square number.
- Square root Maths
- The number that makes a square number when multiplied by itself. The square root of 49 is 7.
- Stanza English
- A group of lines in a poem, like a paragraph in a story.
- Star Science
- A huge ball of hot, glowing gas that gives out light, like our Sun.
- Storage Computers
- The place where a computer keeps files for a long time.
- Straight angle Maths
- An angle of exactly 180 degrees, which makes a straight line.
- Subject English
- The part of a sentence that tells who or what the sentence is about.
- Subtraction Maths
- Taking one number away from another to find what is left. The sign is -.
- Suffix English
- Letters added to the end of a word to change its meaning, like "ful" in "helpful".
- Sum Maths
- The total you get when you add numbers together.
- Summary English
- A short retelling of the main points of something.
- Syllable English
- A beat in a word. "Elephant" has three syllables: el-e-phant.
- Symmetry Maths
- When one half of a shape is an exact mirror picture of the other half.
- Synonym English
- A word that means nearly the same as another word. "Big" and "large" are synonyms.
T
- Tab Computers
- A part of a browser window that holds one web page. You can open many tabs.
- Tally mark Maths
- A small stroke used to count things. Every fifth stroke is drawn across the four before it.
- Temperature Science
- How hot or cold something is.
- Tense English
- The form of a verb that tells when something happens: past, present or future.
- Theme English
- The big idea or lesson of a story, like friendship or honesty.
- Thermometer Science
- A tool that measures temperature.
- Thesaurus English
- A book or website that lists words with their synonyms and antonyms.
- Tissue Science
- A group of the same kind of cells that work together, like muscle.
- Title English
- The name of a book, story, poem or film.
- Topic sentence English
- The sentence that tells the main idea of a paragraph, usually the first one.
- Touchscreen Computers
- A screen you can control by touching it with your finger.
- Transparent Science
- Clear enough to see through, like clean glass.
- Trapezium Maths
- A four-sided shape with at least one pair of parallel sides.
- Triangle Maths
- A flat shape with three straight sides and three corners.
U
- Unit Maths
- A standard amount we use to measure, like a metre, a kilogram or a litre.
- Universe Science
- Everything that exists: all the stars, planets, galaxies and space.
- Upload Computers
- To send a file from your device to the internet.
- URL Computers
- The address of a web page, such as the text you type at the top of a browser.
- USB Computers
- A common kind of plug and socket for connecting devices like pen drives to a computer.
- Username Computers
- The name you use to log in to an account. It can be public, unlike your password.
V
- Vaccine Science
- A medicine that teaches the body to fight a particular germ before it can make you ill.
- Variable Maths
- A letter, like x, that stands for a number that can change or that we do not know yet.
- Variable (coding) Computers
- A named box in a program that stores a value which can change, like a score.
- Verb English
- A word for an action or a state, like "run", "think" or "is".
- Verse English
- A line or a group of lines in a poem or song.
- Vertebrate Science
- An animal with a backbone, like a fish, a bird or a person.
- Vertex Maths
- A corner, where two or more edges meet. The plural is vertices.
- Vertical Maths
- Straight up and down, like a flagpole.
- Vibration Science
- A fast back-and-forth movement. Sounds are made by vibrations.
- Virus (biology) Science
- A tiny germ, much smaller than bacteria, that can make people ill. It can only multiply inside living cells.
- Virus (computer) Computers
- A harmful program that spreads from computer to computer and can damage files.
- Vitamin Science
- A substance in food that the body needs in small amounts to stay healthy.
- Volcano Science
- An opening in the Earth's crust where hot melted rock, ash and gas can burst out.
- Voltage Science
- The push that makes electric current flow in a circuit. We measure it in volts.
- Volume Maths
- The amount of space that a solid thing takes up, measured in cubic units.
- Vowel English
- The letters a, e, i, o and u, which make the open sounds in words.
W
- Water vapour Science
- Water in the form of an invisible gas.
- Watt Science
- A unit for measuring power, such as how much electrical energy a bulb uses each second.
- Weather Science
- What the air outside is like today: sunny, rainy, windy, hot or cold.
- Website Computers
- A group of web pages that belong together, found at one address.
- Weight Science
- How strongly gravity pulls on an object.
- Whole number Maths
- A number with no fractions, starting from 0: 0, 1, 2, 3 and so on.
- Wi-Fi Computers
- A way to connect devices to the internet without wires.
- Window Computers
- A box on a computer screen that shows a program or a file.
- Word processor Computers
- A program for writing and changing documents, such as Word or Writer.
X
- X-axis Maths
- The flat line going across a graph from left to right.
- X-ray Science
- A kind of invisible energy wave that doctors use to take pictures of bones inside the body.
- Xylem Science
- The tiny tubes in a plant that carry water up from the roots.
Y
- Y-axis Maths
- The line going up and down a graph.
- Yeast Science
- A tiny fungus used to make bread rise.
- Yes or no question English
- A question that can be answered with just "yes" or "no", like "Are you ready?".
Z
- Zero Maths
- The number that means nothing, or none. It is also the placeholder in numbers like 105.
- Zip file Computers
- A file that squeezes other files into a smaller package, so they are easier to store and send.
- Zoology Science
- The science of animals.