Definition of twin adjective from the Oxford Advanced Learner's Dictionary

      

    twin

     adjective
    adjective
    BrE BrE//twɪn//
     
    ; NAmE NAmE//twɪn//
     
    [only before noun]
     
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  1. 1  used to describe one of a pair of children who are twins twin boys/girls a twin brother/sister
  2. 2used to describe two things that are used as a pair a ship with twin propellers
  3. 3used to describe two things that are connected, or present or happening at the same time The prison service has the twin goals of punishment and rehabilitation.
  4. Word Origin late Old English twinn ‘double’, from twi- ‘two’; related to Old Norse tvinnr. Current verb senses date from late Middle English.
See the Oxford Advanced American Dictionary entry: twin