quadruplicate
▸ adjective /kwɒˈdruːplɪkət 
/ consisting of four parts or elements. ▪ of which four copies are made.
▸ verb [with object] /kwɒˈdruːplɪkeɪt / multiply (something) by four. – PHRASES in quadruplicate in four identical copies. – DERIVATIVES quadruplication /kwɒˌdruːplɪˈkeɪʃn / noun – ORIGIN mid 17th century: from Latin quadruplicat- ‘quadrupled’, from the verb quadruplicare, from quadruplex, quadruplic- ‘fourfold’, from quadru- ‘four’ + plicare ‘to fold’.
EnglishOxford Dictionary of English
