American English

Definition of main noun from the Oxford Advanced American Dictionary



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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 also 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 the Oxford Advanced Learner's Dictionary entry: main