excavation (n.)youdaoicibaDictYouDict[excavation 词源字典]
1610s, "action of excavating," from Latin excavationem (nominative excavatio) "a hollowing out," noun of action from past participle stem of excavare "to hollow out" (see excavate). Meaning "an excavated place" is from 1779.[excavation etymology, excavation origin, 英语词源]