fungible (adj.)youdaoicibaDictYouDict[fungible 词源字典]
"capable of being used in place of another; capable of being replaced," 1818, a word in law originally, from Medieval Latin fungibilis, from Latin fungi "perform" (see function (n.)) via phrases such as fungi vice "to take the place." Earlier as a noun (1765).[fungible etymology, fungible origin, 英语词源]