Dictionary definition · quadruple
noun
- a set of four similar things considered as a unit
- a quantity that is four times as great as another
verb
- increase fourfold"His stock earning quadrupled"
adjective
- having four units or components"quadruple rhythm has four beats per measure"
- four times as great or many"a fourfold increase in the dosage"
Source: Open English WordNet (CC BY 4.0).