Source : WordNet®

parsec
     n : a unit of astronomical length based on the distance from
         Earth at which stellar parallax is 1 second of arc;
         equivalent to 3.262 light years [syn: {secpar}]

Source : Free On-Line Dictionary of Computing

PARSEC
     
        Extensible language with PL/I-like syntax, derived from
        PROTEUS.  "PARSEC User's Manual", Bolt Beranek & Newman (Dec
        1972).