Alternative form of p.m.

Initialism of post meridiem. (The second half of the day, from noon (12:00:00) to (just before) midnight (23:59:59)) / Initialism of post mortem. / Initialism of prime minister.

To project manage. / (Internet, transitive) To send a private message to (a participant in a chat room, etc.).

Initialism of partially meet.

Third-person singular simple present indicative form of PM

plural of PM

(initialism) Performance management system, performance measurement system or performance monitoring system [Note that these are NOT synonymous, but are used in the same field, so intended usage should be confirmed if important.]

(informal, intransitive) To experience premenstrual syndrome or premenstrual stress.

(initialism) Pantone Matching System, a proprietary set of color designations

Initialism of polymeric methylene diphenyl diisocyanate.