1. (noun) public address system, P.A. system, PA system, P.A., PA
an electronic amplification system used as a communication system in public areas
Synonyms: daddy, atomic number 91, protactinium, dad, pascal, pappa, dada, public address system, protoactinium, papa, pop
2. (noun) dad, dada, daddy, pa, papa, pappa, pop
an informal term for a father; probably derived from baby talk
Synonyms: tonic, dada, protoactinium, atomic number 91, pa, popping, pappa, dad, pop, papa, daddy, public address system, dadaism, pop music, protactinium, soda pop, soda water, pascal, soda
3. (noun) protactinium, protoactinium, Pa, atomic number 91
a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
Synonyms: daddy, atomic number 91, protactinium, dad, public address system, pappa, dada, pascal, protoactinium, papa, pop
4. (noun) pascal, Pa
a unit of pressure equal to one newton per square meter
Synonyms: daddy, atomic number 91, protactinium, dad, public address system, pappa, dada, pascal, protoactinium, papa, pop
5. (adverb) Pennsylvania, Keystone State, PA
a Mid-Atlantic state; one of the original 13 colonies
Synonyms: daddy, atomic number 91, protactinium, dad, public address system, pappa, dada, pascal, protoactinium, papa, pop
6. (adverb) per annum, p.a., per year, each year, annually
by the year; every year (usually with reference to a sum of money paid or received)
Synonyms: p.a., yearly, each year, every year, per year, annually, per annum
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Synonyms and Antonyms of p.a. 
