Definition of dementia
1
: a usually progressive condition (such as Alzheimer's disease) marked by the development of multiple cognitive deficits (such as memory impairment, aphasia, and the inability to plan and initiate complex behavior)
… dementia is diagnosed only when both memory and another cognitive function are each affected severely enough to interfere with a person's ability to carry out routine daily activities. — The Journal of the American Medical Association
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Merriam-Webster unabridged
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Time Traveler for dementia
The first known use of dementia was in 1806
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