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dementia

noun [U]
 
 
/dɪˈmen.ʃə/ specialized

Definition

a medical condition that affects especially old people, causing the memory and other mental abilities to gradually become worse, and leading to confused behaviour: The most common form of dementia is Alzheimer's disease.Mental and psychiatric disorders
(Definition of dementia noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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