Definition of argument noun from the Oxford Advanced American Dictionary

      

    argument

     noun
    noun
    NAmE//ˈɑrɡyəmənt//
     
     
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  1. 1 [countable, uncountable] a conversation or discussion in which two or more people disagree, often angrily to win/lose an argument After some heated argument, they finally made a decision. argument (with somebody) (about/over something) We had an argument with the waiter about the check. argument with somebody She got into an argument with the teacher.
  2. 2[countable] a reason or set of reasons that someone uses to show that something is true or correct Her main argument was a moral one. argument for/against something There are strong arguments for and against euthanasia. argument that… His argument was that public spending must be reduced.
  3. 3[uncountable] argument (about something) the act of disagreeing in a conversation or discussion using a reason or set of reasons Let's assume for the sake of argument (= in order to discuss the problem) that we can't start till March.
See the Oxford Advanced Learner's Dictionary entry: argument