The Collaborative International Dictionary
Quadruplication
Quadruplication \Quad`ru*pli*ca"tion\, n. [L. quadruplicatio: cf. F. quadruplication.] The act of making fourfold; a taking four times the simple sum or amount.
Douglas Harper's Etymology Dictionary
quadruplication
1570s, from Latin quadruplicationem (nominative quadruplicatio), noun of action from past participle stem of quadruplicare (see quadruplicate (v.)).
Wiktionary
quadruplication
n. multiplication by four