Definition of major noun from the Oxford Advanced American Dictionary

      

    major

     noun
    noun
    NAmE//ˈmeɪdʒər//
     
     
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  1. 1 [countable] (abbreviation Maj.) an officer of fairly high rank in the army or the air force Major Smith He's a major in the U.S. army. see also drum major, sergeant major
  2. 2 [countable] the main subject or course of a student at college or university Her major is French. compare minor
  3. 3 [countable] a student studying a particular subject as the main part of their course She's a French major.
  4. 4 the majors [plural] (sport) the Major Leagues
See the Oxford Advanced Learner's Dictionary entry: major