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English definition of “banner”

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banner

noun uk   /ˈbæn.ər/ us    //
[C] a long piece of cloth with words written on it, sometimes stretched between two poles and carried by people taking part in a march: The demonstrators walked along the street, carrying banners and shouting angrily. [C] a banner advertisement [S] an idea, principle, or belief that is strongly supported by someone: They won the election under the banner of lower taxes.
(Definition of banner from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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