"quadruple" in the noun sense
1. quartet, quartette, quadruplet, quadruple
a set of four similar things considered as a unit
a quantity that is four times as great as another
"quadruple" in the verb sense
"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"
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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