Dictionary![]() ![]() se•nilePronunciation: (sē'nīl, -nil, sen'īl), [key] —adj. 1. 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. 2. of or belonging to old age or aged persons; gerontological; geriatric. 3. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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