Meaning of “leader” in the English Dictionary

"leader" in English

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leadernoun [ C ]

uk /ˈliː.dər/ us /ˈliː.dɚ/

leader noun [ C ] (CONTROLLING)

B1 a person in control of a group, country, or situation:

a religious leader
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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(Definition of “leader” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"leader" in American English

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leadernoun [ C ]

us /ˈli·dər/

leader noun [ C ] (PERSON IN CONTROL)

a person who manages or controls other people, esp. because of his or her ability or position:

leader noun [ C ] (THE FIRST)

someone or something that is the first or the most important:

Her company is a leader in the women’s clothing industry.

(Definition of “leader” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"leader" in Business English

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leadernoun [ C ]

uk /ˈliːdər/ us

a company, product, etc. that has higher sales than its competitors:

The brand is market leader in France, where it has a 49% market share.

a person who is in charge of a group, country, situation, etc.:

Union leaders said they expect up to 40,000 of the 47,000 workers at the plant to stop work.
Business leaders claim that the area has one of the fastest growing local economies in the country.
local/state/world leaders State and local leaders were on hand to discuss the crisis.

(Definition of “leader” from the Cambridge Business English Dictionary © Cambridge University Press)