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- Rhymes: -ɪlɪti
- (chiefly uncountable) Senescence; the bodily and mental deterioration associated with old age.
- (chiefly uncountable) The losing of memory and reason due to senescence.
- He was entering his years of senility and not liking it a bit.
- (countable, archaic) An elderly, senile person.
the losing of memory and reason
an elderly, senile person