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
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)