preparation (n.)youdaoicibaDictYouDict[preparation 词源字典]
late 14c., "act of preparing," from Latin praeparationem (nominative praeparatio) "a making ready," noun of action from past participle stem of praeparare "prepare," from prae "before" (see pre-) + parare "make ready" (see pare). Meaning "a substance especially prepared" is from 1640s.[preparation etymology, preparation origin, 英语词源]