Definition of leading adjective from the Oxford Advanced Learner's Dictionary

      

    leading1

     adjective
    adjective
    BrE BrE//ˈliːdɪŋ//
     
    ; NAmE NAmE//ˈliːdɪŋ//
     
    [only before noun]
     
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  1. 1  most 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. 2  ahead of others in a race or contest She started the last lap just behind the leading group. These are the leading first-round scores.
  3. Extra examples He’s a leading business analyst. Leading experts were brought to the scene of the crime. a leading brand/​manufacturer/​supplier
See the Oxford Advanced American Dictionary entry: leading