annexation (n.)youdaoicibaDictYouDict[annexation 词源字典]
1620s, from Medieval Latin annexiationem (nominative annexatio) "action of annexing," noun of action from past participle stem of annexare (see annex). The Middle English noun form was annexion "union; joining; territory acquired" (mid-15c.).[annexation etymology, annexation origin, 英语词源]