A

A¹ a [eı] n plural A's a's

1.) [U and C]

the first letter of the English alphabet

2.) [U and C]

the sixth note in the musical ↑scale of C ↑major or the musical ↑key based on this note

3.)

the highest mark that a student can get in an examination or for a piece of work

▪ I got an A in French.

▪ Julia got straight As (=all A's) in high school.

4.) an A student

AmE someone who regularly gets the best marks possible for their work in school or college

5.) [U]

used to refer in a short way to one of two different things or people. You can call the second one B

▪ A demands £500, B offers £100.

→plan A at ↑plan¹ (5)

6.) from A to B

from one place to another

get/go from A to B

▪ Hiring a car was the best way to get from A to B.

7.) from A to Z

describing, including, or knowing everything about a subject

▪ the history of 20th century art from A to Z

8.) A34, A40 etc

the name of a road in Britain that is smaller than a ↑motorway, but larger than a ↑B-road

→↑A-road

9.) [U]

a common type of blood

→↑A level

A ²

A²

the written abbreviation of amp or amps