The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

semicolon
    n 1: a punctuation mark (`;') used to connect independent
         clauses; indicates a closer relation than does a period

The Free On-line Dictionary of Computing (30 December 2018):

semicolon
;

   ;

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