A 1 , a / eɪ / 名词 ( 复数形式 A’s , a’s )

1 [可数和不可数名词] the first letter of the English alphabet

2 [可数和不可数名词] the sixth note in the musical scale of C major or the musical key based on this note

3 [可数名词] 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 A’s (= all A’s ) in high school. → A level

4 an A student American English someone who regularly gets the best marks possible for their work in school or college

5 [不可数名词] 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 plan 1 ( 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 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 [不可数名词] a common type of blood