A set of four similar things considered as a unit.

synonyms: quadruplet, quartet, quartette.

A quantity that is four times as great as another.

Polish: kwadrupla

Increase fourfold.

Dutch: verviervoudigen

Having four units or components:
— Quadruple rhythm has four beats per measure.
— Quadruplex wire.

synonyms: four-fold, fourfold, quadruplex, quadruplicate.

Roget 96: fourfold, four times; quadrable^†, quadrumanous^†, quadruple, quadruplicate, quadrible^†; fourth.    quadrifoliate^†, quadrifoliolate^†, quadrigeminal^†, quadrigeminate^†, quadriplanar^†, quadriserial^†.    ... show more

Four times as great or many.

synonyms: four-fold, fourfold.

Polish: czterokrotny, poczwórny