from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or being the older of two, especially the older of two persons having the same name, as father and son.
  • adj. Of or relating to senior citizens. See Usage Note at old.
  • adj. Being in a position, rank, or grade above others of the same set or class: a senior officer; the senior ship in the battle group.
  • adj. Having precedence in making certain decisions.
  • adj. Of or relating to the fourth and last year of high school or college: our senior class.
  • n. A person who is older than another: She is eight years my senior.
  • n. A senior citizen.
  • n. One that is of a higher position, rank, or grade than another in the same set or class.
  • n. A student in the fourth year of high school or college.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Older; superior
  • adj. Higher in rank within a publicly traded company or other organization.
  • adj. of or pertaining to a student's final academic year at a high school (twelfth grade) or university.

from the GNU version of the Collaborative International Dictionary of English

  • adj. More advanced than another in age; prior in age; elder; hence, more advanced in dignity, rank, or office; superior.
  • adj. Belonging to the final year of the regular course in American colleges, or in professional schools.
  • n. A person who is older than another; one more advanced in life.
  • n. One older in office, or whose entrance upon office was anterior to that of another; one prior in grade.
  • n. An aged person; an older.
  • n. 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.

from The Century Dictionary and Cyclopedia

  • Older; elder: when following a personal name, as John Smith, senior (usually abbreviated Sr. or Sen.), it denotes the older of two persons in one family or community of that name.
  • 2. Older in office or service: as, a senior judge, colonel, etc.
  • 3. Belonging or pertaining to the fourth or last year of the curriculum of an American college, seminary, or other institution: as, the senior class.
  • n. A person who is older than another; one more advanced in life; an elder.
  • n. One who is older in office or service, or whose first entrance upon such office or service was anterior to that of another.
  • n. 3. An aged person; one of the older inhabitants.
  • n. In the universities of England, one of the older fellows of a college. See seniority, 3.
  • n. In the United States, a student in the fourth year of the curriculum in colleges or seminaries; also, one in the last or most advanced year in certain professional schools; by extension, a student in the most advanced class in various institutions.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an undergraduate student during the year preceding graduation
  • adj. older; higher in rank; longer in length of tenure or service
  • adj. advanced in years; (`aged' is pronounced as two syllables)
  • adj. used of the fourth and final year in United States high school or college
  • n. a person who is older than you are


Middle English, from Latin, comparative of senex, old.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin senior ("older"), comparative form of senex ("old"); see senate. (Wiktionary)


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