Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adv. 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adv. before noon, in the morning.

from The Century Dictionary and Cyclopedia

  • Before midday: applied to the time between midnight and the following noon. Regularly abbreviated to A. M.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. before noon
  • adv. before noon

Etymologies

Latin ante, before + merīdiem, accusative of merīdiēs, noon.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin ante ("before") + merīdiēm, accusative singular of merīdiēs ("noon, midday"). (Wiktionary)

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