pa > define
noun
- An informal term for a father; probably derived from baby talk.
- A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead.
- synonyms: protactinium, protoactinium, atomic number 91
- A unit of pressure equal to one newton per square meter.
- synonyms: pascal
- A Mid-Atlantic state; one of the original 13 colonies.
- synonyms: Pennsylvania, Keystone State
- An electronic amplification system used as a communication system in public areas.
- synonyms: public address system, P. A. System, PA system, P. A.
by WordNet 3.0 © 2006 by Princeton University
(n.) A shortened form of Papa.
by Webster's Revised Unabridged Dictionary
(Military) PA stands for one of the following: parent relay; physician assistant; primary agency; probability of arrival; public affairs
by Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.