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English definition of “annex”

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annex

verb [T]  /əˈneks, ˈæn·eks/ us  

annex verb [T] (TAKE)

to take possession of an area of land or a country and add it to a larger area, usually by force: The United States annexed parts of Texas and New Mexico, which belonged to Mexico.
annexation
noun [C/U]  /ˌæn·ekˈseɪ·ʃən, ˌæn·ək-/ us  
[U] the annexation of Latvia by the Soviet Union
(Definition of annex verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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