Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Language: Latin
Origin: ante meridiem 'before noon'

a.m.
     
Related topics: Chronology
a.m. also am British English
TMC
ante meridiem
used to talk about times that are after midnight but before midday [↪ PM]:
Work starts at 9 am.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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