Source : Webster's Revised Unabridged Dictionary (1913)

Semicolon \Sem"i*co`lon\, n.
   The punctuation mark [;] indicating a separation between
   parts or members of a sentence more distinct than that marked
   by a comma.

Source : WordNet®

semicolon
     n : a punctuation mark (`;') used to connect independent
         clauses; indicates a closer relation than does a period

Source : Free On-Line Dictionary of Computing

semicolon
     
        ;
     
        Common: {ITU-T}: semicolon; {semi}.  Rare: weenie; {INTERCAL}:
        hybrid, pit-thwong.