‖De‐men″ti‐a (?), n. [L., fr. demens. See Dement.] Insanity; madness; esp. that form which consists in weakness or total loss of thought and reason; mental imbecility; idiocy.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.