Definition of leading adjective from the Oxford Advanced American Dictionary

      

    leading1

     adjective
    adjective
    NAmE//ˈlidɪŋ//
     
    [only before noun]
     
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  1. 1most important or most successful leading experts She was offered the leading role in the new TV series. He played a leading part in the negotiations.
  2. 2ahead of others in a race or contest She started the last lap just behind the leading group. These are the leading first-round scores.
See the Oxford Advanced Learner's Dictionary entry: leading