Main entry: quadruple, quadruplet, quartet, quartette
Definition: a set of four similar things considered as a unit
Main entry: quad, quadruplet
Definition: one of four children born at the same time from the same pregnancy
Main entry: IV, Little Joe, tetrad, 4, four, foursome, quartet, quatern, quaternary, quaternion, quaternity, quadruplet
Definition: the cardinal number that is the sum of three and one