A set of four similar things considered as a unit
English: quartet, quartette, quadruplet, quadruple
quadrupleEnglish
quadruple, four-fold, fourfold, quadruplet, quadruplex
Noun
A quantity that is four times as great as another
English: quadruple
Adjective
Four times as great or many
English: quadruple, fourfold, four-fold
Having four units or components
English: quadruple, quadruplicate, quadruplex, fourfold, four-fold
Verb
Increase fourfold
English: quadruple