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Definition of a.m. abbreviation from the Oxford Advanced American Dictionary

  

a.m.

 abbreviation
(also A.M.) abbreviation
NAmE//ˌeɪ ˈɛm//
 
 
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 between midnight and noon (from Latin‘ante meridiem’) It starts at 10 a.m. compare p.m.
See a.m. in the Oxford Advanced Learner's Dictionary
Check pronunciation: a.m.

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