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dementia

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dementia/dɪˈmɛnʃə/noun
pluraldementias
dementia
/dɪˈmɛnʃə/
noun
pluraldementias
Learner's definition of DEMENTIA  
medical
: a mental illness that causes someone to be unable to think clearly or to understand what is real and what is not real
[noncount]
[count]
— see also senile dementia
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