heyday

¹ American  

[hey-dey] / ˈheɪ deɪ /

interjection

Archaic.

1. (used as an exclamation of cheerfulness, surprise, wonder, etc.)

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heyday ² American  

[hey-dey] / ˈheɪˌdeɪ /

Or heydey

noun

1. the stage or period of greatest vigor, strength, success, etc.; prime.

   the heyday of the vaudeville stars.

2. Archaic. high spirits.

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heyday British  

/ ˈheɪˌdeɪ /

noun

1. the time of most power, popularity, vigour, etc; prime

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Etymology

Origin of heyday¹

1520–30; rhyming compound based on hey; replacing heyda < German hei da hey there

Origin of heyday¹

1580–90; variant of high day, apparently by confusion with heyday ²

Example Sentences

Like many in Venezuela, the 68-year-old expressed nostalgia for the heyday of the Caribbean country between the 1950s and 1970s, when it was flush with oil riches.

From Barron's

‘Jay Kelly’ gives the actor and activist a chance to return to his awards heyday.

From Los Angeles Times

Pulp's first album since 2001, More, somehow manages to sound as if it was recorded and shelved in their mid-90s heyday.

From BBC

It is an unexpected resurgence, especially given that in its heyday, Zamrock never really left the African continent.

From BBC

Union membership has declined dramatically since labor’s heyday in the 1950s, when roughly a third of the U.S. workforce was unionized.

From The Wall Street Journal