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English definition of “leader”

leader

noun [C] (WINNING)    /ˈliː.dər/ US  /-dɚ/
C1 someone or something that is winning during a race or other situation where people are competing : He's fallen two laps behind the leaders. Microsoft is a world leader in software design .Winners and losers
(Definition of leader noun (WINNING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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