Definify.com
Webster 1913 Edition
Seniority
Sen-ior′i-ty
,Noun.
The quality or state of being senior.
Webster 1828 Edition
Seniority
SENIOR'ITY
,Noun.
1. Eldership; superior age; priority of birth. He is the elder brother, and entitled to the plae of seniority.
2. Priority in office; as the seniority of a pastor or counselor.