1. (noun) four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe
the cardinal number that is the sum of three and one
Synonyms: quartette, quadruple, quaternion, quartet, quaternary, quad, tetrad, four, foursome, quaternity, intravenous feeding, quadruplet, quatern, four-spot
2. (noun) quadruplet, quad
one of four children born at the same time from the same pregnancy
Synonyms: quadriceps femoris, quaternary, quadruplet, quartet, quadruple, quadrangle, quatern, quad, four, quartette, quaternion, quadriceps, space, quaternity, foursome, tetrad, musculus quadriceps femoris
3. (noun) quartet, quartette, quadruplet, quadruple
a set of four similar things considered as a unit
Synonyms: quartette, quaternion, quartet, quaternary, quad, quaternity, tetrad, foursome, four, quadruple, quadruplet, quatern
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Synonyms for quadruplet 
