| Noun | 1. | junior - term of address for a disrespectful and annoying male; "look here, junior, it's none of your business" | |
| 2. | junior - a third-year undergraduate | |
| 3. | junior - the younger of two menadult male, man - an adult male person (as opposed to a woman); "there were two women and six men on the bus" | |
| 4. | Junior - a son who has the same first name as his fatherson, boy - a male human offspring; "their son became a famous judge"; "his boy is taller than he is" | |
| Adj. | 1. | junior - younger; lower in rank; shorter in length of tenure or serviceyoung, immature - (used of living things especially persons) in an early period of life or development or growth; "young people" senior - older; higher in rank; longer in length of tenure or service; "senior officer" | |
| 2. | junior - used of the third or next to final year in United States high school or college; "the junior class"; "a third-year student"intermediate - lying between two extremes in time or space or degree; "going from sitting to standing without intermediate pushes with the hands"; "intermediate stages in a process"; "intermediate stops on the route"; "an intermediate level" | |
| 3. | junior - including or intended for youthful persons; "a junior sports league"; "junior fashions"young, immature - (used of living things especially persons) in an early period of life or development or growth; "young people" | |