Definition of First Lady noun from the Oxford Advanced Learner's Dictionary

     

    First Lady

     noun
    noun
    BrE
     
    ; NAmE
     
    [usually singular]
     
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  1. 1the First Lady (in the US) the wife of the President
  2. 2(North American English) the wife of the leader of a state
  3. 3(also first lady) the woman who is thought to be the best in a particular profession, sport, etc. the first lady of country music
See the Oxford Advanced American Dictionary entry: First Lady