fourfold

Adjective

• having four units or components
  • quadruple rhythm has four beats per measure
    
  • quadruplex wire
    

• four times as great or many
  • a fourfold increase in the dosage
    

Adverb

• by a factor of four
  • the price of gasoline has increased fourfold over the past two years
    

Related words

• Synonyms: 
  quadruple , quadruplicate , quadruplex , four-fold , four times