Definition of convention noun from the Oxford Advanced American Dictionary

        

    convention

     noun
    noun
    NAmE//kənˈvɛnʃn//
     
     
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  1. 1 [countable] a large meeting of the members of a profession, a political party, etc. synonym conference to hold a convention the Democratic Party Convention (= to elect a candidate for President)
  2. 2 [countable, uncountable] the way in which something is done that most people in a society expect and consider to be polite or the right way to do it social conventions By convention the co-chair was always a woman. She is a young woman who enjoys going against conventions. Convention demands that a club member should resign in such a situation.
  3. 3[countable] an official agreement between countries or leaders the Geneva convention the United Nations convention on the rights of the child
  4. 4[countable, uncountable] a traditional method or style in literature, art, or the theater the conventions of Greek tragedy
See the Oxford Advanced Learner's Dictionary entry: convention