a.m.

or A.M.
1) hor before noon
2) hor the period from midnight to noon, esp. the period of daylight prior to noon
Compare p.m. Etymology: 1755–65; < L ante merīdiem usage: The abbreviation a.m. refers to the period from midnight until noon. One minute before noon is 11:59 a.m. One minute after noon is 12:01 p.m. Many people distinguish between noon and midnight by saying 12 noon and 12 midnight. Expressions such as 6 a.m. in the morning and 9 p.m. at night are redundant.

From formal English to slang. 2014.

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