fourfold

Adverb
  1. By a factor of four (synset 400346296)
    "the price of gasoline has increased fourfold over the past two years"
Adjective
  1. Four times as great or many (synset 302227002)
    "a fourfold increase in the dosage"
  2. Having four units or components (synset 302227145)
    "quadruple rhythm has four beats per measure"; "quadruplex wire"

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