Definition of "senility" in English

noun

1. (chiefly uncountable) The bodily and mental deterioration associated with old age: Synonym of senescence.

   • Near-synonym: second childhood

2. (chiefly uncountable) The losing of memory and reason due to senescence.

   • He was entering his years of senility and not liking it a bit.

3. (countable, archaic) An elderly, senile person.