Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To make (a person) insane.
  • transitive v. To cause (a person) to lose intellectual capacity.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. insane, demented
  • n. An insane person, or one afflicted with dementia
  • v. To drive mad; to craze

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To deprive of reason; to make mad.
  • adj. Demented; dementate.

from The Century Dictionary and Cyclopedia

  • Out of one's mind; insane; demented.
  • n. A demented person; one affected by loss of mental capacity.
  • To bring into a state of dementia; destroy the mind of.

Etymologies

Late Latin dēmentāre, from Latin dēmēns, dēment-, senseless : dē-, de- + mēns, mind; see men-1 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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