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ante meridiem - 3 dictionary results

an⋅te me⋅rid⋅i⋅em

[an-tee muh-rid-ee-uhm, -em] .

Origin:
1555–65
an·te me·rid·i·em   (ān'tē mə-rĭd'ē-əm)   
adv.   & adj. Abbr. A.M. or a.m. or A.M.
Before noon. Used chiefly in the abbreviated form to specify the hour: 10:30 A.M.; an A.M. appointment. See Usage Note at A.M.

[Latin ante, before + merīdiem, accusative of merīdiēs, noon.]

ante meridiem 
1563, from L., lit. "before noon," from ante (see ante) + acc. of meridies "midday, noon" (see meridian).
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