1. [ noun ] term of address for a disrespectful and annoying male

"look here, junior, it's none of your business"

Related terms: upstart
2. [ adjective ] younger; lower in rank; shorter in length of tenure or service
Related terms: senior younger junior-grade inferior minor young seniority
3. [ adjective ] (education) used of the third or next to final year in United States high school or college
Synonyms: next-to-last third-year

"the junior class" "a third-year student"

Related terms: intermediate
4. [ noun ] (education) a third-year undergraduate
Related terms: lowerclassman
5. [ noun ] the younger of two men
Related terms: man
6. [ noun ] Last name, frequency rank in the U.S. is 12396
7. [ noun ] Man's first name, popularity rank in the U.S. is 532
8. [ adjective ] including or intended for youthful persons

"a junior sports league" "junior fashions"

Related terms: young
9. [ noun ] a son who has the same first name as his father
Synonyms: Jnr Jr
Related terms: son