A, a definition, meaning - what is A, a in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “A, a”

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A, a

noun uk   us   // (plural As, A's or a's)

A, a noun (LETTER)

[C or U] the first letter of the English alphabet

A, a noun (MUSIC)

[C or U] a note in Western music: 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 your work is considered excellent: Sophie got an A for English. She got straight As (= all her marks were As) in her final exams. Jim is a straight-A student (= all his marks are A).
(Definition of A, a from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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