Heyday meaning

hā'dā'
The period of greatest popularity, success, or power; prime.
noun
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Used to express surprise, joy, or wonder.
interjection
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The time of greatest health, vigor, success, prosperity, etc.; prime.
noun
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An earlier time period in which something was very popular. For example, "the CP/M operating system had its heyday in the 1980s." Pronounced "hay-day."
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The early twentieth century was the heyday of the steam locomotive.

noun
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A lively greeting.
interjection
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Origin of heyday

  • Perhaps alteration of heyda exclamation of pleasure probably alteration of Middle English hey hey
    From American Heritage Dictionary of the English Language, 5th Edition
  • Late 16th century, from earlier heyda (1520s), as exclamation – compare hey, hei. Sense “period of success, vigor” from 1751, which respelt as heyday based on unrelated day (as “period of time”) – compare day in the sun.
    From Wiktionary