noun an informal term for a father.
— synonyms: dad, dada, daddy, papa, pappa, pop
noun a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead.
— synonyms: protactinium, protoactinium, atomic_number_91
noun a unit of pressure equal to one newton per square meter.
— synonyms: pascal
noun a Mid-Atlantic state.
— synonyms: Pennsylvania, Keystone_State, Pa.
noun an electronic amplification system used as a communication system in public areas.
— synonyms: public_address_system, P.A._system, PA_system, P.A.