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(noun) P.A., P.A. system, PA system, public address system
an electronic amplification system used as a communication system in public areas
(noun) Pennsylvania, Keystone State
a Mid-Atlantic state; one of the original 13 colonies
(noun) dad, dada, daddy, pop, pa, papa, pappa
an informal term for a father; probably derived from baby talk
a unit of pressure equal to one newton per square meter
(noun) protactinium, protoactinium, atomic number 91, Pa
a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead