- after noon.
- the period between noon and midnight.
Origin of p.m.
From the Latin word post merīdiem
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
P.M., pm or PM
- (indicating the time period from midday to midnight) post meridiemSee a.m.
- post-mortem (examination)
(sense 1) Latin: after noon
Word Origin and History for p.m.
abbreviation of Latin post meridiem "after noon."
Online Etymology Dictionary, © 2010 Douglas Harper