Definition of mainstream adjective from the Oxford Advanced Learner's Dictionary

     

    mainstream

     adjective
    adjective
    BrE BrE//ˈmeɪnstriːm//
     
    ; NAmE NAmE//ˈmeɪnstriːm//
     
    [usually before noun]
     
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  1. 1considered normal because it reflects what is done or accepted by most people mainstream culture/politics mainstream economists/journalists the mainstream press/media
  2. 2mainstream education is for children who do not have any special needs or difficulties
See the Oxford Advanced American Dictionary entry: mainstream