Meaning of “atheist” in the English Dictionary

"atheist" in British English

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atheistnoun [ C ]

uk /ˈeɪ.θi.ɪst/ us /ˈeɪ.θi.ɪst/

someone who believes that God does not exist

atheism
noun [ U ] uk /ˈeɪ.θi.ɪ.zəm/ us /ˈeɪ.θi.ɪ.zəm/
atheist
adjective uk us also atheistic, uk /ˌeɪ.θiˈɪs.tɪk/ us

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

"atheist" in American English

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atheistnoun [ C ]

us /ˈeɪ·θi·ɪst/

someone who believes that God does not exist

atheistic
adjective us /ˌeɪ·θiˈɪs·tɪk/

atheistic books and articles

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