Public accountant.
Power amplifier.
Public Act.
Pennsylvania, a state of the United States of America
Papua, a province of Indonesia
Pará, a state of Brazil
Palestinian Authority
Proto-Algic (sometimes abbreviated PAc to distinguish it from Proto-Algonquian)
Proto-Athapaskan
Proto-Algonquian (sometimes abbreviated PAn to distinguish it from Proto-Algic, but usually just abbreviated PA with Proto-Algic being abbreviated PAc)
An assistant to another person, especially to a superior or more important person.
In literature, theatre/theater, etc., a good foil of the protagonist, a character who helps emphasize the traits of the main character.