quadruplicate

Concise Oxford English Dictionary © 2008 Oxford University Press:
quadruplicate

▶adjective /kwɒˈdruːplɪkət/ 

• 1 consisting of four parts or elements.

• 2 of which four copies are made.

▶verb /kwɒˈdruːplɪkeɪt/ 

• 1 multiply by four.

• 2 (usu. as adj. quadruplicated) make or provide four copies of.

– derivatives
quadruplication noun,
quadruplicity noun.

– origin C17: from L. quadruplicat-, quadruplicare ‘quadruple’.