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Adjective: fourfold  'for,fówld
  1. Having four units or components
    "fourfold rhythm has four beats per measure";
    - quadruple, quadruplicate, quadruplex, four-fold
     
  2. Four times as great or many
    "a fourfold increase in the dosage";
    - quadruple, four-fold
Adverb: fourfold  'for,fówld
  1. By a factor of four
    "the price of petrol has increased fourfold over the past two years";
    - four times

See also: multiple