senior

Etymology

From Middle English senior, from Latin senior (“older”), comparative form of senex (“old”); see senate. Doublet of seigneur, seignior, sire, sir, and señor.

adj

1. Older; superior
   senior citizen
2. Higher in rank, dignity, or office.
   senior member; senior counsel
3. (US) Of or pertaining to a student's final academic year at a high school (twelfth grade) or university.

noun

1. (now chiefly US) An old person.
2. Someone older than someone else (with possessive).
   He was four years her senior.
3. Someone seen as deserving respect or reverence because of their age.
4. (obsolete, biblical) An elder or presbyter in the early Church.
5. Somebody who is higher in rank, dignity, or office.
6. (US, Philippines) A final-year student at a high school or university.