supermajority

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su·per·ma·jor·i·ty

 (so͞o′pər-mə-jôr′ĭ-tē, -jŏr′-)
n. pl. su·per·ma·jor·i·ties
A specified majority of votes, such as 60 percent, required to approve a motion or pass legislation.

supermajority

(ˌsuːpəməˈdʒɒrɪtɪ)
n, pl -ties
(Government, Politics & Diplomacy) a specified majority of votes (that exceeds the simple majority) needed to approve a motion

su•per•ma•jor•i•ty

(ˈsu pər məˌdʒɔr ɪ ti, -ˌdʒɒr-)

n., pl. -ties.
a majority greater than a specified number, as 60%, of the total: required to pass certain types of legislation, override vetoes, etc.
[1990–95]