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

     

    duke

     noun
    noun
    BrE BrE//djuːk//
     
    ; NAmE NAmE//duːk//
     
     
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  1. 1a nobleman of the highest rank the Duke of Edinburgh
  2. 2(in some parts of Europe, especially in the past) a male ruler of a small independent state
  3. see also archduke, duchess, duchy, grand duke
    Word Origin Old English (denoting the ruler of a duchy), from Old French duc, from Latin dux, duc- ‘leader’; related to ducere ‘to lead’.