"quadruple" in the noun sense
1. quartet, quartette, quadruplet, quadruple
a set of four similar things considered as a unit
2. quadruple
a quantity that is four times as great as another
"quadruple" in the verb sense
1. quadruple
increase fourfold
"His stock earning quadrupled"
"quadruple" in the adjective sense
1. quadruple, quadruplicate, quadruplex, fourfold, four-fold
having four units or components
"quadruple rhythm has four beats per measure"
"quadruplex wire"
2. quadruple, fourfold, four-fold
four times as great or many
"a fourfold increase in the dosage"
Source: WordNet® (An amazing lexical database of English)
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