A, a Meaning in the Cambridge English Dictionary
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Meaning of “A, a” in the English Dictionary

"A, a" in British English

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A, anoun

uk   us   // (plural As, A's or a's)

A, a noun (LETTER)

[C or U] the first ​letter of the ​Englishalphabet

A, a noun (MUSIC)

[C or U] a ​note in ​Westernmusic: This ​concerto is in the ​key of A ​major.

A, a noun (MARK)

[C or U] a ​mark in an ​exam or for a ​piece of ​work that ​shows that ​yourwork is ​consideredexcellent: Sophie got an A for ​English. She got straight As (= all her ​marks were As) in her ​finalexams. Jim is a straight-A ​student (= all his ​marks are A).
(Definition of A, a from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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