Definition of complexity noun from the Oxford Advanced American Dictionary

      

    complexity

     noun
    noun
    NAmE//kəmˈplɛksət̮i//
     
     
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  1. 1[uncountable] the state of being formed of many parts; the state of being difficult to understand the increasing complexity of modern telecommunication systems I was astonished by the size and complexity of the problem.
  2. 2complexities [plural] the features of a problem or situation that are difficult to understand the complexities of the system
See the Oxford Advanced Learner's Dictionary entry: complexity