Old age; a general term for a variety of organic disorders, both physical and mental, occurring in old age. [see senile]
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se·nil·i·ty si-'nil-ət-ēalso se- n, pl -ties the quality or state of being senile specif the physical and mental infirmity of old age
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se·nil·i·ty (sə-nilґĭ-te) [L. senilitas] old age. 2. the physical and mental deterioration associated with old age.Medical dictionary. 2011.