or hey·dey

[ hey-dey ]
/ ˈheɪˌdeɪ /


the stage or period of greatest vigor, strength, success, etc.; prime: the heyday of the vaudeville stars.
Archaic. high spirits.

Nearby words

  1. hexylcaine hydrochloride,
  2. hexylresorcinol,
  3. hey,
  4. hey rube,
  5. hey-ho,
  6. heyduck,
  7. heyer,
  8. heyer-pudenz valve,
  9. heyerdahl,
  10. heyerdahl, thor

Origin of heyday

1580–90; variant of high day, apparently by confusion with heyday2

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for heydey

British Dictionary definitions for heydey


/ (ˈheɪˌdeɪ) /


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

Word Origin for heyday

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

Word Origin and History for heydey



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