PA

Definition:

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

Synonyms:

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