quadruplicate

Adjective

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

Noun

• any four copies; any of four things that correspond to one another exactly
  • it was signed in quadruplicate
    

Verb

• reproduce fourfold
  • quadruplicate the bill
    

Related words

• Synonyms: 
  quadruple , quadruplex , fourfold , four-fold