Pa

from WordNet (r) 3.0 (2006)

pa
    n 1: an informal term for a father; probably derived from baby
         talk [syn: {dad}, {dada}, {daddy}, {pa}, {papa}, {pappa},
         {pop}]
    2: a short-lived radioactive metallic element formed from
       uranium and disintegrating into actinium and then into lead
       [syn: {protactinium}, {protoactinium}, {Pa}, {atomic number
       91}]
    3: a unit of pressure equal to one newton per square meter [syn:
       {pascal}, {Pa}]
    4: a Mid-Atlantic state; one of the original 13 colonies [syn:
       {Pennsylvania}, {Keystone State}, {PA}]
    5: an electronic amplification system used as a communication
       system in public areas [syn: {public address system}, {P.A.
       system}, {PA system}, {P.A.}, {PA}]

from The Collaborative International Dictionary of English v.0.48

Pa \Pa\ (p[aum]), n.
   A shortened form of {Papa}.
   [1913 Webster]

from The Free On-line Dictionary of Computing (8 July 2008)

pa

   <networking> The {country code} for Panama.

   (1999-01-27)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

PA
       Precision Architecture (HP)

from Moby Thesaurus II by Grady Ward, 1.0

19 Moby Thesaurus words for "pa":
      abba, dad, daddy, father, foster father, genitor, governor,
      old man, pap, papa, pappy, pater, paterfamilias, patriarch, pop,
      pops, sire, stepfather, the old man

from Moby Thesaurus II by Grady Ward, 1.0

45 Moby Thesaurus words for "PA":
      Gramophone, PA system, Victrola, audio sound system, audiophile,
      binaural system, bitch box, bullhorn, cartridge, ceramic pickup,
      changer, crystal pickup, derived four-channel system,
      discrete four-channel system, four-channel stereo system, hi-fi,
      hi-fi fan, high-fidelity, intercom, intercommunication system,
      jukebox, magnetic pickup, monaural system, mono, needle,
      nickelodeon, phonograph, photoelectric pickup, pickup,
      public-address system, quadraphonic sound system,
      radio-phonograph combination, record changer, record player,
      sound reproduction system, sound truck, squawk box, stereo, stylus,
      system, tape deck, tape recorder, tone arm,
      transcription turntable, turntable