From 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]
From WordNet (r) 3.0 (2006) :
semicolon
n 1: a punctuation mark (`;') used to connect independent
clauses; indicates a closer relation than does a period
From The Free On-line Dictionary of Computing (30 December 2018) :
semicolon
;
;
Common: ITU-T: semicolon; semi. Rare: weenie; INTERCAL:
hybrid, pit-thwong.