Meaning of “open day” in the English Dictionary

british dictionary

"open day" in British English

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open daynoun [ C ]

uk /ˈəʊ.pən ˌdeɪ/ us /ˈoʊ.pən ˌdeɪ/ UK US open house

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