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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.).
a formal act whereby a state proclaims its sovereignty over territory hitherto outside its domain. Unlike cession, whereby territory is given or sold through treaty, annexation is a unilateral act made effective by actual possession and legitimized by general recognition