Heyday refers to the time of greatest success, popularity, or strength in someone's life or history of something. The Beatles were in their heyday in the 1960s.
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Not Always Past
Heyday often reflects on a past time, but can be used to predict future potential success. This is the heyday for young tech startups.
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Cultural Reference
Understanding local history or a person’s biography can reveal their 'heyday' in that context. Many people consider the 1980s the heyday of arcade video games.