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fourfold (adj.)

Old English feowerfeald; see four + -fold. As an adverb from 1530s. Similar formation in Old Frisian fiuwerfald, Dutch viervoudig, Old High German fiervalt, German vierfältig, Danish firfold, Gothic fidurfalþs.

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Definitions of fourfold from WordNet
1
fourfold (adj.)
four times as great or many;
a fourfold increase in the dosage
Synonyms: quadruple / four-fold
fourfold (adj.)
having four units or components;
Synonyms: quadruple / quadruplicate / quadruplex / four-fold
2
fourfold (adv.)
by a factor of four;
the price of gasoline has increased fourfold over the past two years
Synonyms: four times
From wordnet.princeton.edu