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)


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