pa meaning and definition

PA noun

Definition of pa (noun)

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