Double majority

A double majority is a voting system which requires a majority of votes according to two separate criteria. The mechanism is usually used to require strong support for any measure considered to be of great importance.

Two special cases that technically fit the definition but are usually not considered double majority are double chambers^[a], where a law must have a majority in two chambers of a legislative body to pass; and quorums, where the measure requires not only a majority but also a turnout minimum.
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