American English

Definition of leader noun from the Oxford Advanced American Dictionary



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  1. 1a person who leads a group of people, especially the head of a country, an organization, etc. a political/spiritual, etc. leader the leader of the movement union leaders He was not a natural leader. She's a born leader.
  2. 2a person or thing that is the best, or in first place in a race, business, etc. She was among the leaders of the race from the start. The company is a world leader in electrical goods. see also market leader
See the Oxford Advanced Learner's Dictionary entry: leader