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banner noun

Click to hear the UK pronunciation of this wordClick to hear the US pronunciation of this word/ˈbæn.ər //-ɚ/ n

Definition

[C] a long piece of cloth, often stretched between two poles, with a sign written on it, usually carried by people taking part in a march
The demonstrators walked along the street, waving banners and shouting angrily.
[C] (ALSO banner ad/banner advertisement ) an advertisement that appears across the top of a web page
[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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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