pa

noun

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

   Synonyms

   • dad, dada, daddy, papa, pappa, pop

   Less specific

   • father, male parent, begetter

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

   Synonyms

   • protactinium, protoactinium, Pa, atomic number 91

   Less specific

   • metallic element, metal

3. a unit of pressure equal to one newton per square meter

   Synonyms

   • pascal, Pa

   Less specific

   • pressure unit

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

   Synonyms

   • Pennsylvania, Keystone State, PA

   Parts

   • University of Pennsylvania, Pennsylvania, Penn, Allentown, Altoona, Bethlehem, Erie, Gettysburg, Harrisburg, capital of Pennsylvania, Chester, Philadelphia, City of Brotherly Love, Pittsburgh, Alleghenies (more) , Allegheny Mountains, Allegheny, Allegheny River, Blue Ridge Mountains, Blue Ridge, Lehigh River, Monongahela, Monongahela River, Susquehanna, Susquehanna River

   Part of

   • United States, United States of America, America, the States, US, U, USA, U, Mid-Atlantic states

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

   Synonyms

   • public address system, P, PA system, P, PA

   Less specific

   • communication system

   Parts

   • amplifier, loudspeaker, speaker, speaker unit, loudspeaker system, speaker system, tannoy