Definition of

P.m.

  1. (adj, all) after noon
  2. (adv, all) between noon and midnight

via WordNet, Princeton University

Synonyms of P.m.

post meridiem

Origin of the word P.m.

  1. abbreviation of L. post meridiem "after noon" (1647). more

via Online Etymology Dictionary, ©2001 Douglas Harper

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a United States liquid unit equal to 16 fluid ounces; two pints equal one quart