Same word as quadrivia:
quadrigeminal, quadripartition, quadrivium, quadrumvirate, quadruple, quadruplet, quadruplets, quartet, quartette, quaternary, quaternion, quaternity, tetrad, tetralogy
quadrigeminal, quadripartition, quadrivium, quadrumvirate, quadruple, quadruplet, quadruplets, quartet, quartette, quaternary, quaternion, quaternity, tetrad, tetralogy