#1 quadruplet n. [four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, foursome, Little Joe] the cardinal number that is the sum of three and one. wn
#2 quadruplet n. [quad] one of four children born at the same time from the same pregnancy. wn
#3 quadruplet n. [quartet, quartette, quadruple] a set of four similar things considered as a unit. wn
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