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English definition of “a.m.”

a.m.

( also am)     /ˌeɪˈem/
A1 used to refer to a time between 12 o'clock in the night and 12 o'clock in the day: We're open from 9 a.m. to 5 p.m. daily.Days and times of day
(Definition of a.m. from the Cambridge Learner's Dictionary © Cambridge University Press)

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