adv. & adj. (Abbr. P.M. or p.m. or P.M.)
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..
[Latin post merīdiem : post, after + merīdiem, accusative of merīdiēs, midday.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
