1. Abbr. Jr. Used to distinguish a son from his father when they have the same given name.
2. Intended for or including youthful persons: a junior sports league.
3. Lower in rank or shorter in length of tenure: a junior officer; the junior senator.
4. Of, for, or constituting students in the third year of a US high school or college: the junior class.
5. Lesser in scale than the usual.
1. A person who is younger than another: a sister four years my junior.
2. A person lesser in rank or time of participation or service; subordinate.
3. A student in the third year of a US high school or college.
4. A class of clothing sizes for girls and slender women. Also called junior miss.
[Middle English, from Latin iūnior, comparative of iuvenis, young; see yeu- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.