Rarely used term for old age; especially the debility of advanced age. ... Origin: L. The feebleness of age, fr. Seneo, to be old, feeble ... (05 Mar 2000) ... 
Type: Term Pronunciation: sē′nē-ŭm Definitions: 1. Rarely used term for old age; especially the debility of advanced age.
senium The period of old age, especially its debility.