| pa | | |
| dad, dada, daddy, pa, papa, pappa, pop | (n.) | an informal term for a father; probably derived from baby talk. |
| atomic number 91, pa, protactinium, protoactinium | (n.) | a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead. |
| pa, pascal | (n.) | a unit of pressure equal to one newton per square meter. |
| keystone state, pa, pennsylvania | (n.) | a Mid-Atlantic state; one of the original 13 colonies. |
| p.a., p.a. system, pa, pa system, public address system | (n.) | an electronic amplification system used as a communication system in public areas. |
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