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quadruple (v.)

late 14c., from Middle French quadrupler, from Late Latin quadruplare "make fourfold, multiply by four," from Latin quadruplus (adj.) "quadruple, fourfold," from quadri- "four" (from PIE root *kwetwer- "four") + -plus "-fold" (see -plus).

quadruple (adj.)

1550s, from Middle French quadruple (13c.), from Latin quadruplus "fourfold," from quadri- "four" (from PIE root *kwetwer- "four") + -plus "-fold" (see -plus).

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Definitions of quadruple from WordNet
1
quadruple (n.)
a set of four similar things considered as a unit;
Synonyms: quartet / quartette / quadruplet
quadruple (n.)
a quantity that is four times as great as another;
2
quadruple (adj.)
having four units or components;
quadruple rhythm has four beats per measure
Synonyms: quadruplicate / quadruplex / fourfold / four-fold
quadruple (adj.)
four times as great or many;
Synonyms: fourfold / four-fold
3
quadruple (v.)
increase fourfold;
His stock earning quadrupled
From wordnet.princeton.edu