quadruplicate (v.) Look up quadruplicate at Dictionary.com
1660s, from Latin quadruplicatus, past participle of quadruplicare "make fourfold," from quadri- "four" (from PIE root *kwetwer- "four") + plicare "to fold" (see ply (v.1)). Related: Quadruplicated; quadruplicating.
quadruplicate (adj.) Look up quadruplicate at Dictionary.com
1650s, from Latin quadruplicatus, past participle of quadruplicare "make fourfold," from quadri- "four" (from PIE root *kwetwer- "four") + plicare "to fold" (see ply (v.1)).