duplication
n.
early 15c., "doubling," from Middle French duplicacion (13c.) and directly from Latin duplicationem (nominative duplicatio), noun of action from past participle stem of duplicare (see duplicate, adj.). Meaning "repetition" is from 1580s.
〔蒋〕[du=two二，-ation名词后缀] 成双，成倍，复制，复制品
〔蒋〕[plic=fold折，重叠，-ation名词后缀] 成双，成倍，复制，复制品