Power amplifier.
Public accountant.
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)
The deputy of a provincial governor or general in ancient Rome.
An ambassador or messenger.
A deputy representing the pope, specifically a papal ambassador sent on special ecclesiastical missions.
To leave as a legacy.