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WordReference Random House Unabridged Dictionary of American English © 2024se•nil•i•ty (si nil′i tē),USA pronunciation n. - Pathologythe state of being senile, esp. the weakness or mental infirmity of old age.
WordReference Random House Learner's Dictionary of American English © 2024se•nile /ˈsinaɪl, ˈsɛnaɪl/USA pronunciation adj. - showing a decline of physical strength or mental functioning as a result of old age or disease.
se•nil•i•ty /sɪˈnɪlɪti/USA pronunciation n. [uncountable]See -sene-. WordReference Random House Unabridged Dictionary of American English © 2024se•nile (sē′nīl, -nil, sen′īl),USA pronunciation adj. - showing a decline or deterioration of physical strength or mental functioning, esp. short-term memory and alertness, as a result of old age or disease.
- of or belonging to old age or aged persons;
gerontological;
geriatric. - Geography, Place Names[Physical Geog.](of topographical features) having been reduced by erosion to a featureless plain that stands everywhere at base level. Cf. peneplain.
n. - a senile person.
- Latin senīlis old, equivalent. to sen(ex) old man (akin to senior) + -īlis -ile
- 1655–65
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