Definition of evolution noun from the Oxford Advanced American Dictionary

      

    evolution

     noun
    noun
    NAmE//ˌɛvəˈluʃn//
     
    [uncountable]
     
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  1. 1(biology) the gradual development of plants, animals, etc. over many years as they adapt to changes in their environment the evolution of the human species Darwin's theory of evolution
  2. 2 the gradual development of something In politics he preferred evolution to revolution (= gradual development to sudden violent change).
See the Oxford Advanced Learner's Dictionary entry: evolution