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English definition of “a.m.”

a.m.

adverb     /ˌeɪˈem/
A1 used when referring to a time between twelve o'clock at night and twelve o'clock in the middle of the day: The first election results are expected around 1 a.m. → Compare p.m.Days and times of day
(Definition of a.m. adverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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