heyday Meaning in the Cambridge English Dictionary
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Meaning of “heyday” in the English Dictionary

"heyday" in British English

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heydaynoun [C usually singular]

uk   us   /ˈheɪ.deɪ/
the most ​successful or ​popularperiod of someone or something: In ​their heyday, they ​sold as many ​records as all the other ​groups in the ​country put together.
(Definition of heyday from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"heyday" in American English

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heydaynoun [C usually sing]

 us   /ˈheɪˌdeɪ/
a ​period of ​greatsuccess, ​popularity, or ​power: In ​its heyday, Pittsburgh was a ​center of the ​steel and ​coalindustries.
(Definition of heyday from the Cambridge Academic Content Dictionary © Cambridge University Press)
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