Definition of behavior noun from the Oxford Advanced American Dictionary

      

    behavior

     noun
    noun
    NAmE//bɪˈheɪvyər//
     
     
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  1. 1[uncountable] the way that someone behaves, especially toward other people good/bad behavior social/sexual/criminal behavior His behavior toward her was becoming more and more aggressive.
  2. 2 [uncountable, countable] the way a person, an animal, a plant, a chemical, etc. behaves or functions in a particular situation the behavior of dolphins/chromosomes studying human and animal behavior (technology) to study learned behaviors
  3. Idioms
    be on your best behavior
     
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    to behave in the most polite way you can
NAmE//bɪˈheɪvyərəl//
 
adjective children with behavioral difficulties behavioral science (= the study of human behavior)
behaviorally
 
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adverb