Synonyms: quadruple, quadruplet, quartet, quartette
Definition: a set of four similar things considered as a unit
Similar words: set
Definition: a group of things of the same kind that belong together and are so used
Usage: a set of books; a set of golf clubs; a set of teeth
Synonyms: quad, quadruplet
Definition: one of four children born at the same time from the same pregnancy
Synonyms: 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
Definition: one of the elements that collectively form a system of numeration
Usage: 0 and 1 are digits