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pa

1804, colloquial shortening of papa (q.v.).

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Definitions of pa from WordNet
1
pa (n.)
an informal term for a father; probably derived from baby talk;
Synonyms: dad / dada / daddy / papa / pappa / pop
pa (n.)
a Mid-Atlantic state; one of the original 13 colonies;
Synonyms: Pennsylvania / Keystone State / Pa.
pa (n.)
an electronic amplification system used as a communication system in public areas;
Synonyms: public address system / P.A. system / PA system / P.A.
2
Pa (n.)
a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead;
Synonyms: protactinium / protoactinium / atomic number "
Pa (n.)
a unit of pressure equal to one newton per square meter;
Synonyms: pascal
From wordnet.princeton.edu