Definition of a.m. abbreviation from the Oxford Advanced Learner's Dictionary

  

a.m.

 abbreviation
(North American English also A.M.)abbreviation
BrE BrE//ˌeɪ ˈem//
 
; NAmE NAmE//ˌeɪ ˈem//
 
 
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between midnight and midday (from Latin ante meridiem) It starts at 10 a.m. compare p.m. Word Originfrom Latin ante meridiem.
See the Oxford Advanced American Dictionary entry: a.m.