'Dementia' definitions:

Definition of 'dementia'

From: WordNet
noun
Mental deterioration of organic or functional origin [syn: dementia, dementedness]

Definition of 'Dementia'

From: GCIDE
  • Dementia \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. [1913 Webster]

Synonyms of 'dementia'

From: Moby Thesaurus