- the stage or period of greatest vigor, strength, success, etc.; prime: the heyday of the vaudeville stars.
- Archaic. high spirits.
Origin of heyday1
Examples from the Web for heydey
The overthrow of the empire surprised them in the heydey of their happiness.The Honor of the Name
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
According to him, although he was still a young man, the heydey again was gone, never to return.The Retrospect
Page 11, restored chapter head poetry from Fireside Companion version and changed "heydey" to "heyday."Kathleen's Diamonds
Mrs. Alex. McVeigh Miller
- the time of most power, popularity, vigour, etc; prime
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.