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Dement \De*ment"\, v. t. [L. dementare, fr. demens, -mentis, out of one's mind, mad; de + mens mind. See {Mental}, and cf. {Dementate}.] To deprive of reason; to make mad. [R.] --Bale. Dement \De*ment"\, a. [L. demens, - mentis.] Demented; dementate. [R.] --J. H. Newman.