Sen·ior, n.
1. A person who is older than another; one more advanced in life.
2. One older in office, or whose entrance upon office was anterior to that of another; one prior in grade.
3. An aged person; an older.
Each village senior paused to scan,
And speak the lovely caravan. --Emerson.
4. One in the fourth or final year of his collegiate course at an American college; -- originally called senior sophister; also, one in the last year of the course at a professional schools or at a seminary.
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