Longman Dictionary of Contemporary English homepage

A

1 noun
     
Related topics: Letters and punctuation
A1 , a plural A's, a's
1 [uncountable and countable]SLA the first letter of the English alphabet
2 [uncountable and countable] the sixth note in the musical scale of C major or the musical key based on this note
3 [countable] 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

American English someone who regularly gets the best marks possible for their work in school or college
5 [uncountable] 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 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 [uncountable] a common type of blood
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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