Definition of theoretically adverb from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˌθɪəˈretɪkli//
    ; NAmE NAmE//ˌθiːəˈretɪkli//
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  1. 1in a way that is concerned with the ideas and principles on which a particular subject is based, rather than with practice and experiment theoretically sound conclusions These views were challenged both theoretically and empirically. opposite experimentally (1), practically (2)
  2. 2in a way that could possibly exist, happen or be true, although this is unlikely It is theoretically possible for him to overrule their decision, but highly unlikely.