quadruplet

Noun
  1. The cardinal number that is the sum of three and one (synset 113766444)
    is a type of: digit, figure - one of the elements that collectively form a system of numeration
    same as: 4, four, foursome, iv, little joe, quartet, quatern, quaternary, quaternion, quaternity, tetrad
  2. One of four children born at the same time from the same pregnancy (synset 110517230)
    is a type of: sib, sibling - a person's brother or sister
    same as: quad
  3. A set of four similar things considered as a unit (synset 108004531)
    is a type of: set - a group of things of the same kind that belong together and are so used
    same as: quadruple, quartet, quartette

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