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