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

     

    threesome

     noun
    noun
    BrE BrE//ˈθriːsəm//
     
    ; NAmE NAmE//ˈθriːsəm//
     
     
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  1. 1[countable + singular or plural verb] a group of three people They became an inseparable threesome.
  2. 2[countable] an occasion when three people have sex together
See the Oxford Advanced American Dictionary entry: threesome