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a.m.also a.m., 1762 in reference to hours, an abbreviation of Latin ante meridiem "before noon" (q.v.). Synonymous with "morning" by 1776. AM as a type of radio wave broadcast, 1921, a [..]
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a.m.any time in the morning, that is ... • between midnight and midday (noon).
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a.m.A.M. or "ante meridiem" means "before noon." Anytime after 11:59 P.M. and before 12:00 P.M. is A.M. If it is A.M. it is morning.
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a.m.Someone who doesn't spend there time wisely or doesn't go out very often and is unsocialable.
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a.m.(adj) before noon(adv) before noon
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