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  1. [noun] an informal term for a father; probably derived from baby talk
    Synonyms: dad, dada, daddy, pter, pop

  2. [noun] a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
    Synonyms: protactinium, protoactinium, Pa, atomic number 91

  3. [noun] a unit of pressure equal to one newton per square meter
    Synonyms: scal, Pa

  4. [noun] a Mid-Atlantic state; one of the original 13 colonies
    Synonyms: Pennsylvania, Keystone State, PA

  5. [noun] an electronic amplification system used as a communication system in public areas
    Synonyms: public address system, P.A. system, PA system, P.A., PA


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