- [countable, uncountable] the first letter of the English alphabet
- ‘Apple’ begins with (an) A/‘A’.
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- A[countable, uncountable] (music) the 6th note in the scale of C major
- [countable, uncountable] A (in/for something) a grade that a student can get for a piece of work or course of study that shows that it is excellent
- She got (an) A in biology.
- He had straight A's (= nothing but A's) all through high school.
- A[uncountable] used to represent the first of two or more possibilities
- Shall we go for plan A or plan B?
- A[uncountable] used to represent a person, for example in an imagined situation or to hide their identity
- Assume A knows B is guilty.
see also A-frame, A level, A-road
Idioms
See A in the Oxford Advanced American Dictionaryfrom A to B
- from one place to another
- For me a car is just a means of getting from A to B.
from A to Z
- including everything there is to know about something
- He knew his subject from A to Z.
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A