dictionary

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1: an electronic amplification system used as a communication system in public areas [syn: public address system, P.A. system, PA system, PA] 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]

Do you need more info about p.a. , find it at CanadaSpace Reference