Definition of czar noun from the Oxford Advanced American Dictionary

     

    czar

     noun
    (also tsar, tzar)noun
    NAmE//zɑr//
     
    , NAmE//tsɑr//
     
     
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  1. 1the title of the emperor of Russia in the past Czar Nicholas II
  2. 2 (in compounds) an official whose job is to advise the government on policy in a particular area a drug czar
See the Oxford Advanced Learner's Dictionary entry: czar