Making laws
supermajority
Any threshold above half: three-fifths for Senate cloture, two-thirds to override a veto or convict on impeachment, three-fourths of states to ratify an amendment.
In full
Supermajority requirements protect against narrow, temporary majorities, and they hand a determined minority a veto. Which threshold applies is often the whole story of whether something passes: the same bill needs 51 votes on the merits and 60 to end debate, so the effective bar in the Senate is usually the higher one.
Also written as: two-thirds, three-fifths vote
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.