P.m. (abbreviation)

1. Abbreviation of 'post meridiem': the time period from noon or lunchtime until sunset or suppertime.
2. The period of time between noon and midnight, as distinguished from the morning (a.m.).

Origin:

From latin 'post meridiem'.

Examples:

1. The meeting is scheduled for 3 p.m. in the afternoon.
2. The concert starts at 8 p.m. and lasts for two hours.