To multiply by four or consisting of four parts or elements.
From Latin quadruplus, from quadru- (four) + -plus (fold). The word entered English in the 17th century, maintaining its mathematical meaning from Latin usage.
Quadruple is part of a fascinating numerical family that includes double, triple, quintuple, and beyond - but interestingly, English speakers rarely use anything higher than quadruple in everyday speech, preferring 'five times' over 'quintuple.'
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