asthma NOUN
Asthma is a disease of the chest. It causes wheezing and makes it difficult for you to breathe properly.
astonish astonishes, astonishing, astonished VERB
If you are astonished by something or someone, you are very surprised.
astronaut astronauts NOUN
An astronaut is a person who travels in space.
astronomer astronomers NOUN
An astronomer is a scientist who studies the stars and planets.
at
PREPOSITION 1 You use at to say where someone or something is. Rajeev waited for me at the bus stop.
PREPOSITION 2 You use at to show the direction something is going in. I threw the snowball at my brother.
PREPOSITION 3 You use at to say when something happens. The party starts at six o’clock.
ate VERB
Ate is the past tense of eat.
atlas atlases NOUN
An atlas is a book of maps.
atmosphere atmospheres
NOUN 1 A planet’s atmosphere is the layer of air or other gas around it.
NOUN 2 You can use atmosphere to talk about the general mood of a place. In the classroom the atmosphere was relaxed.
atom atoms NOUN
An atom is the smallest part of any substance.
attach attaches, attaching, attached VERB
When you attach something to an object, you join the two things together.
attachment attachments NOUN
An attachment is a computer file that is attached to an e-mail or text message.
attack attacks, attacking, attacked VERB
If a person attacks somebody, they try to hurt them.
attempt attempts, attempting, attempted VERB
If you attempt something difficult, you try to do it.
attend attends, attending, attended VERB
If someone attends something like a meeting, they are present at it.
attention
NOUN 1 If something attracts your attention, you notice it suddenly.
NOUN 2 If you pay attention to someone, you listen carefully to them.
attic attics NOUN
An attic is a room at the top of a house, just under the roof.
attract attracts, attracting, attracted
VERB 1 If something or somebody attracts you, you find them interesting. Joe was attracted to the display by the flashing lights.
VERB 2 If something like a magnet attracts an object, it makes it move towards it.
attractive ADJECTIVE
If something is attractive, it is nice to look at.
audience audiences NOUN
An audience is a group of people watching or listening to something like a play, film, talk or piece of music.
August NOUN
August is the eighth month of the year. It has 31 days.
aunt aunts NOUN
Your aunt is the sister of one of your parents, or the wife of your uncle.
author authors NOUN
The author of a book is the person who wrote it.
authority authorities