a state of mental illness or insanity; the condition of being out of one's mind.
From Latin 'dementia,' combining 'de-' (from, away) and 'mens' (mind). It literally means 'away from mind' and has referred to mental deterioration since Roman times.
The word 'dementia' comes from this same root, and it's remarkable that the Romans already understood that some mental conditions were about the mind moving away from its normal state.
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