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English definition of “A, a”

A, a

noun [C or U] (MARK)    // (plural As, A's or a's)
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 end-of-year exams.US Jim is a straight-A student (= all his marks are A).Marks and results
(Definition of A, a noun (MARK) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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