i Register
In some senses, heyday is marked as archaic, obsolete. Watch for register when choosing this word.
noun
A period of success, popularity, or power; prime.
The early twentieth century was the heyday of the steam locomotive.
Must your hot ytch and plurisie of lust, The heyday of your luxury, be fedd Up to a surfeite, and could none but I Be pickt out to be cloake to your close tricks, Your belly-sports?
An exultation of the spirits; gaiety; frolic.
intj
A lively greeting.
"Heyday, Miss Morland!" said he. "What is the meaning of this? I thought you and I were to dance together."
An expression of frolic and exultation, and sometimes of wonder.
"Come follow me, my wags, and say, as I say. There's no riches but in rags; hey day, hey day, &c."
Bass. Heydey! good words, good words, I must beleeue'em And be a Coxcombe for my labor.