dementia
US /dɪˈmen.ʃə/
UK /dɪˈmen.ʃə/

1.
démence
a chronic or persistent disorder of the mental processes caused by brain disease or injury and marked by memory disorders, personality changes, and impaired reasoning.
:
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Early diagnosis of dementia can help manage its progression.
Un diagnostic précoce de la démence peut aider à gérer sa progression.
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She is studying the effects of aging on dementia.
Elle étudie les effets du vieillissement sur la démence.