Main entry: P.A., P.A. system, PA, PA system, public address system
Definition: an electronic amplification system used as a communication system in public areas
Main entry: annually, per annum, per year, p.a., each year
Definition: by the year; every year (usually with reference to a sum of money paid or received)
Usage: he earned $100,000 per annum; we issue six volumes per annum