[seen-yer] 
| 1. | older or elder (usually designating the older of two men bearing the same name, as a father whose son is named after him, often written as Sr. or sr. following the name): I would like to see the senior Mr. Hansen Mr. Edward Andrew Hansen, Sr. Compare junior (def. 1). |
| 2. | of earlier appointment or admission, as to an office, status, or rank: a senior partner. |
| 3. | of higher or the highest rank or standing. |
| 4. | (in American schools, colleges, and universities) of or pertaining to students in their final year or to their class. |
| 5. | (in certain American colleges and universities) of or pertaining to the final two years of education, during which a student specializes in a certain field of study. |
| 6. | of, for, or pertaining to a senior citizen or senior citizens as a group: senior discounts on local bus fares. |
| 7. | of earlier date; prior to: His appointment is senior to mine by a year. |
| 8. | Finance. having a claim on payments, assets, dividends, or the like prior to other creditors, mortgages, stockholders, etc. |
| 9. | a person who is older than another. |
| 10. | a person of higher rank or standing than another, esp. by virtue of longer service. |
| 11. | (in the U.S.) a student in the final year at a high school, preparatory school, college, or university. |
| 12. | a fellow holding senior rank in a college at an English university. |
| 13. | a senior citizen. |
| 14. | (initial capital letter ) a member of the Girl Scouts from 14 through 17 years of age. |
| sen·ior (sēn'yər) adj.
[Middle English, from Latin, comparative of senex, old; see sen- in Indo-European roots.] |