Source : WordNet®

personal computer
     n : a small digital computer based on a microprocessor and
         designed to be used by one person at a time [syn: {PC}, {microcomputer}]

Source : Free On-Line Dictionary of Computing

personal computer
     
         (PC) A general-purpose single-user {microcomputer}
        designed to be operated by one person at a time.
     
        This term and the concept has been successfully hijacked by
        {IBM} due to the huge market share of the {IBM PC}, despite
        its many obvious weaknesses when compared to other equally
        valid claimants to the term, e.g. the {Acorn} {Archimedes},
        {Amiga}, {Atari}, {Macintosh}.
     
        (1994-11-02)