an informal term for a father; probably derived from baby talk

[ Syn: dad , dada , daddy , papa , pappa , pop ]

a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

[ Syn: protactinium , protoactinium , pa , atomic number 91 ]

a unit of pressure equal to one newton per square meter

[ Syn: pascal , pa ]

a Mid-Atlantic state; one of the original 13 colonies

[ Syn: pennsylvania , keystone state , pa ]

an electronic amplification system used as a communication system in public areas

[ Syn: public address system , p.a. system , pa system , p.a. , pa ]