Junior (athletics) definition

(1) Including or intended for youthful persons

"A junior sports league"

"Junior fashions"

(2) Younger; lower in rank; shorter in length of tenure or service

(3) The younger of two men

(4) A third-year undergraduate

(5) A son who has the same first name as his father

(6) Term of address for a disrespectful and annoying male

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