derivation
n.
early 15c., from Middle French dérivation (14c.), from Latin derivationem (nominative derivatio) "a leading off, turning away," noun of action from past participle stem of derivare (see derive). Grammatical sense is older; general meaning "origination, descent" is from c.1600.
〔李〕[deriv =to derive引导出，衍生出；-ation →] n. the act or fact of deriving引出，衍生，由来