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quadruple (v.)

late 14c., "to make four times as much or as many," from 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). Intransitive sense of "become four times as much" is by 1776.

quadruple (adj.)

"consisting of four parts, fourfold, four times told," 1550s, from French quadruple (13c.), from Latin quadruplus "fourfold," from quadri- "four" (from PIE root *kwetwer- "four") + -plus "-fold" (see -plus). Earlier in English as a noun, "a fourfold amount," early 15c., from Latin quadruplum.

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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