p.a.

Noun	1.	P.A. - an electronic amplification system used as a communication system in public areas P.A. system, PA system, public address system, PA amplifier - electronic equipment that increases strength of signals passing through it communication system - a system for communicating loudspeaker, loudspeaker system, speaker system, speaker unit, speaker - electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance tannoy - a loudspeaker
Adv.	1.	p.a. - 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" per annum, per year, annually, each year

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