noun
- The cardinal number that is the sum of three and one.
- synonyms: four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, foursome, Little Joe
- One of four children born at the same time from the same pregnancy.
- synonyms: quad
- A set of four similar things considered as a unit.
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). quadruplet. Retrieved September 22, 2026, from http://smartdefine.org/quadruplet/definitions/1231716 |
| Chicago | WordNet. 2010. "quadruplet" http://smartdefine.org/quadruplet/definitions/1231716 (accessed September 22, 2026). |
| Harvard | WordNet 2010, quadruplet, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/quadruplet/definitions/1231716>. |
| MLA | WordNet. "quadruplet" 23 October 2010. Web. 22 September 2026. <http://smartdefine.org/quadruplet/definitions/1231716> |