Definition of senior noun from the Oxford Advanced American Dictionary

     

    senior

     noun
    noun
    NAmE//ˈsinyər//
     
     
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    in school/college
  1. 1 a student in the last year at a high school or college high school seniors compare freshman, junior, sophomore
  2. older person
  3. 2a person who is older than someone else She was ten years his senior. My brother is my senior by two years. compare junior
  4. 3 = senior citizen
  5. higher rank
  6. 4a person who is higher in rank or status She felt unappreciated both by her colleagues and her seniors.
  7. in sport
  8. 5adults or people who have reached an advanced level tennis coaching for juniors and seniors
See the Oxford Advanced Learner's Dictionary entry: senior