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ante meridiem

[an-tee muh-rid-ee-uh m, -em]
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adjective
  1. a.m.
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Origin of ante meridiem

First recorded in 1555–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for ante meridiem

ante meridiem

  1. the full form of a.m.
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Word Origin

Latin, from ante- + merīdiēs midday
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ante meridiem

1560s, Latin, literally "before noon," from ante (see ante) + accusative of meridies "midday, noon" (see meridian).

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Online Etymology Dictionary, © 2010 Douglas Harper