salutation (n.)youdaoicibaDictYouDict[salutation 词源字典]
late 14c., from Old French salutacion "greeting," from Latin salutationem (nominative salutatio) "a greeting, saluting," noun of action from past participle stem of salutare "to greet" (see salute (v.)). As a word of greeting (elliptical for "I offer salutation") it is recorded from 1530s. Related: Salutations.[salutation etymology, salutation origin, 英语词源]