from The American Heritage® Dictionary of the English Language, 4th Edition
- adv. After noon. Used chiefly in the abbreviated form to specify the hour: 10:30 P.M.; a P.M. appointment. See Usage Note at P.M.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. after noon, in the afternoon.
from The Century Dictionary and Cyclopedia
- n. After midday: applied to the time between noon and midnight. Regularly abbreviated P. M., p. m., or p. m.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. after noon
- adv. between noon and midnight
Latin post merīdiem : post, after + merīdiem, accusative of merīdiēs, midday.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin post ("after") + merīdiēm, accusative singular of merīdiēs ("noon, midday"). (Wiktionary)