quintaryyoudaoicibaDictYouDict[quintary 词源字典]
"Originally; †a multiple of five ( obsolete ). Later: something of a fifth level or rank; compare quaternary. rare", Early 18th cent. As noun alteration of quinary, after classical Latin quīntus fifth. As adjective alteration of quinary, after classical Latin quīntus.[quintary etymology, quintary origin, 英语词源]