Find the word definition

Douglas Harper's Etymology Dictionary
p.a.

abbreviation of "public address" (system), attested from 1936.

Wiktionary
p.a.

init. 1 public address system 2 per annum

WordNet
p.a.

adv. by the year; every year (usually with reference to a sum of money paid or received); "he earned $100,000 per annum"; "we issue six volumes per annum" [syn: per annum, per year, each year, annually]

Wikipedia
P.A. (group)

P.A. (short for Parental Advisory) was a Southern hip hop trio, part of the Atlanta-based Dungeon Family. Its members include Mello, K.P. and Big Reese. In 1993, they released their debut album, Ghetto Street Funk. In 1998, they released their second studio album, titled Straight No Chase on DreamWorks Records. The single "Like We Do" became a southern anthem while the group’s second single, "Reservations" secured a spot on the Blade (soundtrack) earning the group a Gold Record for the soundtrack. My Life, Your Entertainment was the group’s second record distributed by DreamWorks Records as well. The single "Sundown" featuring 8Ball filled the southeastern airwaves while BET played the video in heavy rotation.