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p.a. (n.)

abbreviation of public address (system), attested from 1936.

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Definitions of p.a. from WordNet
1
p.a. (adv.)
by the year; every year (usually with reference to a sum of money paid or received);
Synonyms: per annum / per year / each year / annually
2
P.A. (n.)
an electronic amplification system used as a communication system in public areas;
Synonyms: public address system / P.A. system / PA system / pa
From wordnet.princeton.edu

Dictionary entries near p.a.

oz.

Ozark

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ozone

P

p.a.

P.B.S.

P.C.

P.C.P.

P.D.A.

P.D.Q.