Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: post meridiem 'after noon'

p.m.
     
Related topics: Chronology
p.m. also pm British English
TMC used after numbers expressing the time, to show that it is between noon and midnight [↪ a.m.]:
The meeting starts at 2.30 pm.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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