"junior" in the noun sense
term of address for a disrespectful and annoying male
"look here, junior, it's none of your business"
a third-year undergraduate
the younger of two persons
"she is two years my junior"
4. Junior, Jr, Jnr
a son who has the same first name as his father
"junior" in the adjective sense
younger lower in rank shorter in length of tenure or service
2. junior, third-year, next-to-last
used of the third or next to final year in United States high school or college
"the junior class"
"a third-year student"
including or intended for youthful persons
"a junior sports league"
Source: WordNet® (An amazing lexical database of English)
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