E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Denizen.
A made citizeni.e. an alien who has been naturalised by letters patent. (Old French deinzein; Latin de-intus, from within.)
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A denizen is a kind of middle state, between an alien and a natural-born subject, and partakes of both.Blackstone: Cómmentaries, book i. chap. x. p. 374.