Definition of supermajority
: a majority (such as two-thirds or three-fifths) greater than a simple majority
First Known Use of supermajority
Legal Definition of supermajority
: a large majority a provision requiring a supermajority vote — say, 80 % of the common shares instead of the usual bare majority rule — R. C. Clark
Seen and Heard
What made you want to look up supermajority? Please tell us where you read or heard it (including the quote, if possible).