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Noun pa has 5 senses
  1. dad, dada, daddy, pa, papa, pappa, pater, pop - an informal term for a father; probably derived from baby talk
    --1 is a kind of father, male parent, begetter
  2. protactinium, protoactinium, Pa, atomic number 91 - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
    --2 is a kind of metallic element, metal
  3. pascal, Pa - a unit of pressure equal to one newton per square meter
    --3 is a kind of pressure unit
  4. Pennsylvania, Keystone State, PA - a Mid-Atlantic state; one of the original 13 colonies
    --4 is a kind of American state
    --4 is a part of Mid-Atlantic states
    --4 has parts:
     University of Pennsylvania, Pennsylvania, Penn; Allentown; Altoona; Bethlehem; Erie; Gettysburg; Harrisburg, capital of Pennsylvania; Chester; Philadelphia, City of Brotherly Love; Pittsburgh; Allegheny, Allegheny River; Lehigh River; Monongahela, Monongahela River; Susquehanna, Susquehanna River
  5. public address system, P.A. system, PA system, P.A., PA - an electronic amplification system used as a communication system in public areas
    --5 is a kind of communication system
    --5 has parts:
     amplifier; loudspeaker, speaker, speaker unit, loudspeaker system, speaker system; tannoy
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