1. a number that is much more than half of a total, especially the minimum number of votes required to pass certain legislation or make important decisions
Usage: political/legal

Examples

• The constitutional amendment requires a two-thirds supermajority in both houses of Congress.
• The Senate needs a supermajority of 60 votes to end a filibuster.
• The board voted to require a supermajority for any major budget changes.
• Without a supermajority, the opposition party can block the legislation.
• The referendum passed with a supermajority of 75% approval.
• Many state constitutions require a supermajority to raise taxes.