Definition and meaning of supermajority: A supermajority refers to a certain number of votes required to pass a bill or other legislative action in a government body. This number is usually higher than a simple majority, often two-thirds or three-fourths. Supermajority voting is commonly used in the United States Congress and in most state legislatures to ensure that a bill has wide support before it is passed. The use of supermajority voting can lead to gridlock, as it is difficult for a single party to achieve the necessary support.