- Obsolete insanity; madness
- Psychiatry a disorder of the mind affecting perception, memory, and judgment, characterized by reduced ability to remember, control muscular movements, recognize familiar objects and sounds, etc.
Origin of dementiaClassical Latin insanity ; from demens: see dement
Deterioration of intellectual faculties, such as memory, concentration, and judgment, resulting from an organic disease or a disorder of the brain. It is sometimes accompanied by emotional disturbance and personality changes.
Origin of dementiaLatin dēmentia, madness, from dēmēns, dēment-, senseless; see dement.
(usually uncountable, plural dementias)