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Definition of relativity noun from the Oxford Advanced Learner's Dictionary

     

    relativity

     noun
    noun
    BrE BrE//ˌreləˈtɪvəti//
     
    ; NAmE NAmE//ˌreləˈtɪvəti//
     
    [uncountable]
     
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  1. 1(physics) Einstein’s theory of the universe based on the principle that all movement is relative and that time is a fourth dimension related to space
  2. 2(formal) the state of being relative and only able to be judged when compared with something else
See the Oxford Advanced American Dictionary entry: relativity