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English definition of “a.m.”

a.m.

adverb [not gradable] (also A.M.)  /ˈeɪˈem/ us  
used when referring to a time between twelve o’clock at night and twelve o’clock in the middle of the day; past the middle of the night, or in the morning: We fly out of New York late in the evening and arrive in London at 7 a.m. the next morning.
(Definition of a.m. from the Cambridge Academic Content Dictionary © Cambridge University Press)
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