To annex or attach together; to join or incorporate jointly with something else.
From Latin co- (together) plus annex (from Latin 'annexare', from 'ad-' (to) plus 'nexare' (to bind)). The co- prefix suggests mutual or joint annexation.
This word mostly appears in legal and historical documents about territorial disputes—when two parties agree to jointly annex land or when regions unite to claim new territory. It's rarer now that most borders are settled, but it shaped history.
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