n.
Function: adjective
Etymology: Middle English, from Latin, older, elder, comparative of sen-, senex old; akin to Gothic sineigs old, Greek henos
Date: 14th century
1 : of prior birth, establishment, or enrollment ― often used to distinguish a father with the same given name as his son
2 : higher ranking : SUPERIOR < senior officers>
3 : of, relating to, or intended for seniors <a senior center>
4 : having a claim on corporate assets and income prior to other securities