heyday

¹ 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 ² American  

[hey-dey] / ˈheɪ deɪ /

interjection

Archaic.

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

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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

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

Origin of heyday²

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

Example Sentences

This was also the heyday of traveling extravaganzas like Buffalo Bill Cody’s Wild West shows, which featured hundreds of performers re-enacting frontier battles and showing off their hunting and sharpshooting skills.

From The Wall Street Journal

In some ways, the current versions of the Seahawks and Patriots are reminiscent of both of their heydays.

From The Wall Street Journal

In every live performance during their heyday, the pair ended the song by leaning in for a kiss, making audiences go wild.

From Salon

Still, the sport is far behind its heyday when figure skating was the second-most watched sport in the United States after the NFL.

From Los Angeles Times

In their heyday in the early 1900s, there were thousands of these parks across the U.S., with major cities sometimes having several venues.

From The Wall Street Journal