The process or act of revoking denizen status; removing someone's recognized status as a resident or inhabitant.
From denizen + -ation (forming abstract nouns describing processes), with the prefix de- (meaning removal or reversal). This is the opposite of denization.
Just as 'denization' welcomed people in, 'denizenation' cast them out—it shows how languages create opposite concepts by adding 'un-' or 'de-' prefixes to flip meanings upside down.
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