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Definition of relativity noun from the Oxford Advanced American Dictionary

     

    relativity

     noun
    noun
    NAmE//ˌrɛləˈtɪvət̮i//
     
    [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 relativity in the Oxford Advanced Learner's Dictionary
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