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heyday1

[hey-dey] /ˈheɪˌdeɪ/
noun
1.
the stage or period of greatest vigor, strength, success, etc.; prime:
the heyday of the vaudeville stars.
2.
Archaic. high spirits.
Also, heydey.
Origin
1580-1590
1580-90; variant of high day, apparently by confusion with heyday2

heyday2

[hey-dey] /ˈheɪ deɪ/
interjection, Archaic.
1.
(used as an exclamation of cheerfulness, surprise, wonder, etc.)
Origin
1520-30; rhyming compound based on hey; replacing heyda < German hei da hey there
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for hey-day

heyday

/ˈheɪˌdeɪ/
noun
1.
the time of most power, popularity, vigour, etc; prime
Word Origin
C16: probably based on hey
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for hey-day

heyday

n.

late 16c., alteration of heyda (1520s), exclamation of playfulness or surprise, something like Modern English hurrah, apparently an extended form of Middle Elish interjection hey or hei (see hey). Modern sense of "stage of greatest vigor" first recorded 1751, which altered the spelling on model of day, with which this word apparently has no etymological connection.

Online Etymology Dictionary, © 2010 Douglas Harper
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9
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