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

Years after their heyday, Seals & Crofts would be regarded as purveyors of what came to be known as yacht rock.

From Los Angeles Times

For people with limited disposable income, radio offered an affordable form of entertainment, and the medium experienced its heyday in the 1930s.

From The Wall Street Journal

There were once more than 20 greyhound racing tracks in Scotland, with thousands of spectators filling stadiums across the country during its heyday in the early 20th century.

From BBC

During their 1960s heyday, conglomerates were even hotter and they took advantage by using their lofty stock prices to buy hundreds of often unrelated businesses.

From The Wall Street Journal

Through much of its heyday, BuzzFeed saw its revenue grow every year, but it could never quite close the gap on losses that ran as high as $50 million annually.

From MarketWatch