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English definition of “leader”

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leader

noun [C] uk   /ˈliː.dər/ us    /-dɚ/

leader noun [C] (CONTROLLING)

B1 a person in control of a group, country, or situation: a religious leader The Russian leader wants to introduce further changes. He's a natural leader. She was elected as leader of the campaign group.
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leader noun [C] (WINNING)

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.
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leader noun [C] (NEWSPAPER)

UK →  editorial noun

leader noun [C] (MUSIC)

UK ( US concertmaster) the most important violin player in an orchestra
Translations of “leader”
in Korean 지도자…
in Arabic قائد…
in Portuguese líder, dirigente…
in Catalan líder, cap…
in Japanese リーダー, 指導者…
in Italian leader, capo, guida…
in Chinese (Traditional) 控制, 領導,領導人…
in Russian руководитель, глава, лидер…
in Turkish önder, lider, (yarışma) lider…
in Chinese (Simplified) 控制, 领导,领导人…
in Polish lider/ka, przywód-ca/czyni…
(Definition of leader from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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