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dementia

dementia /dɪˈmɛnʃə/ noun
plural dementias
dementia
/dɪˈmɛnʃə/
noun
plural dementias
Britannica Dictionary 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