Meaning

noun mental deterioration of organic or functional origin

originEtymology tree Proto-Indo-European *de Proto-Indo-European *-h₁ Proto-Indo-European *déh₁ Proto-Italic *dē Latin dē Latin dē- Proto-Indo-European *men- Proto-Indo-European *-tis Proto-Indo-European *méntis Proto-Italic *mentis Latin mēns Latin dēment- Proto-Indo-European *-yós Proto-Italic *-ios Old Latin -ios Latin -ius Latin -ia Latin dēmentiabor. English dementia Borrowed from Latin dēmentia.

Etymology from Wiktionary, CC BY-SA 3.0