Meaning of “denier” in the English Dictionary

"denier" in British English

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deniernoun [ C ]

/dɪˈnaɪ.ə/ //

a person who says that something did not happen or that a situation does not exist, especially something that most people agree did happen or does exist:

He has compared climate change deniers to people who denied the link between HIV and Aids.
There are plenty of Holocaust deniers out there.

deniernoun [ U ]

uk /ˈden.i.ər/ us /ˈden.jɚ/ mainly UK

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