Definition of post meridiem; P.M.
- after noon
Usage examples of post meridiem; P.M.
The meeting starts at 3 P.M., three hours after noon.
Because P.M. means post meridiem, 11 P.M. is late at night, not late morning.
The store opens at 9 A.M. and closes at 8 P.M., after the afternoon and evening business hours.