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

  • adj. Used to distinguish a son from his father when they have the same given name.
  • adj. Intended for or including youthful persons: a junior sports league.
  • adj. Lower in rank or shorter in length of tenure: a junior officer; the junior senator.
  • adj. Of, for, or constituting students in the third year of a U.S. high school or college: the junior class.
  • adj. Lesser in scale than the usual.
  • n. A person who is younger than another: a sister four years my junior.
  • n. A person lesser in rank or time of participation or service; subordinate.
  • n. A student in the third year of a U.S. high school or college.
  • n. A class of clothing sizes for girls and slender women. Also called junior miss.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Younger.
  • adj. Of or pertaining to a third academic year in a four-year high school (eleventh grade) or university.
  • adj. Low in rank; having a subordinate role, job, or situation.
  • n. A younger person.
  • n. A third-year student at a high school or university.
  • n. A name suffix used after a son's name when his father has the same name. Abbreviation: Jr.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Less advanced in age than another; younger. Abbreviated Jr.
  • adj. Lower in standing or in rank, or having entered later into a position or office
  • adj. Composed of juniors, whether younger or a lower standing; ; of or pertaining to juniors or to a junior class. See Junior, n., 2.
  • adj. Belonging to a younger person, or an earlier time of life.
  • adj. of or relating to the third year of a four-year term; -- used of the third or next to final year in a U. S. high school or college. See junior{2}, n..
  • n. A younger person.
  • n. One of a lower or later standing; specifically, in American colleges and four-year high schools, one in the third year of his course, one in the fourth or final year being designated a senior; in some seminaries, one in the first year, in others, one in the second year, of a three years' course.

from The Century Dictionary and Cyclopedia

  • Younger; not as old as another.
  • Younger or lower in standing, as in a profession, especially the bar: as, a junior counsel; a junior partner in a firm or company.
  • In American colleges and schools, pertaining to the third year of the course, the next below the senior or last year; in institutions having a three years' course, usually pertaining to the first year (the second being called the middle year): as, the junior class; junior students.
  • n. A person younger than another.
  • n. One of less experience or inferior standing in his profession than another, who is called his senior; one employed as the subordinate of another, especially at the bar.
  • n. In American colleges and seminaries, a member of the junior class; a student in the junior year.

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

  • adj. younger; lower in rank; shorter in length of tenure or service
  • adj. used of the third or next to final year in United States high school or college
  • n. a son who has the same first name as his father
  • n. a third-year undergraduate
  • n. term of address for a disrespectful and annoying male
  • adj. including or intended for youthful persons
  • n. the younger of two persons


Middle English, from Latin iūnior, comparative of iuvenis, young.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin junior, contr. of juvenior, compar. of iuvenis ("young"); see juvenile. (Wiktionary)



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