.a.m

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Oxford Essential Dictionary

a.m.

 (American also A.M.) abbreviation
You use a.m. after a time to show that it is between midnight and midday:
I start work at 9?a.m.
You use p.m. for times between midday and midnight.

Longman Dictionary of Contemporary English

a.m.

a.m. BrE AmE (also am British English) /ˌeɪ ˈem/
[Date: 1700-1800; Language: Latin; Origin: ante meridiem 'before noon']
(ante meridiem) used to talk about times that are after ↑midnight but before ↑midday ⇨ p.m.:
Work starts at 9 am.

Oxford Advanced Learner's Dictionary

a.m.

 

a.m. (NAmE also A.M.)  [ˌeɪ ˈem]    [ˌeɪ ˈem]  abbreviation
between midnight and midday (from Latin ante meridiem )
It starts at 10 a.m.
compare  p.m.  
Word Origin:

[a.m.] from Latin ante meridiem.

Cambridge Advanced Learner's Dictionary

a.m.

a.m. (MORNING), am /ˌeɪˈem/
adverb
used when referring to a time between twelve o'clock at night and twelve o'clock in the middle of the day:
The first election results are expected around 1 a.m.

Collins Advanced Learner’s English Dictionary

a.m.

/eɪ em/
also am

a.m. is used after a number to show that you are referring to a particular time between midnight and noon. Compare p.m.
The program starts at 9 a.m.