Definition of first lady noun from the Oxford Advanced American Dictionary

     

    first lady

     noun
    noun
     
    [usually singular]
     
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  1. 1 the First Lady the wife of the President of the United States
  2. 2 the wife of the governor of a state
  3. 3the woman who is thought to be the best in a particular profession, sport, etc. the first lady of country music
See the Oxford Advanced Learner's Dictionary entry: first lady