Definition of JUNIOR

  1. (noun)term of address for a disrespectful and annoying male
  2. (noun)a third-year undergraduate
  3. (noun)the younger of two persons
  4. (adj)used of the third or next to final year in United States high school or college
  5. (adj)including or intended for youthful persons
  6. (adj)younger; lower in rank; shorter in length of tenure or service