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Definition of main noun from the Oxford Advanced American Dictionary

     

    main

     noun
    noun
    NAmE//meɪn//
     
     
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  1. 1a large pipe that carries water or gas to a building; a large cable that carries electricity to a building a leaking gas main see water main
  2. 2a large pipe that carries waste water and sewage (= human waste, etc.) away from a building
    3. Idioms
    in the main
     
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    used to say that a statement is true in most cases The service here is, in the main, reliable. In the main, the money raised goes to children's charities.
See main in the Oxford Advanced Learner's Dictionary
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