or hey·dey

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

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. 2018

Examples from the Web for heydey

Historical Examples of heydey

  • The overthrow of the empire surprised them in the heydey of their happiness.

    The Honor of the Name

    Emile Gaboriau

  • Their mother, who came of an impoverished line of princes—the H——s— had died at Petersburg when her husband was in his heydey.

    Fathers and Children

    Ivan Sergeevich Turgenev

  • The popular printed magazines in America had their heydey in the muckraking period about ten years ago.

    The Photoplay

    Hugo Mnsterberg

  • According to him, although he was still a young man, the heydey again was gone, never to return.

    The Retrospect

    Ada Cambridge

  • Page 11, restored chapter head poetry from Fireside Companion version and changed "heydey" to "heyday."

    Kathleen's Diamonds

    Mrs. Alex. McVeigh Miller

British Dictionary definitions for heydey


  1. 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