say it: kwah-DROO-puhl
quadruple is a noun, adjective and verb meaning "a set of four similar things considered as a unit". It carries 5 recorded senses.
a set of four similar things considered as a unit
a quantity that is four times as great as another
having four units or components
“quadruple rhythm has four beats per measure”
“quadruplex wire”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for quadruple come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.