Added 9 October 2026
heyday
/ˈheɪdeɪ/ noun
noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about heyday at Wordnik → Where our words come from →
- The period of greatest prosperity or productivity.
Origin
Late 16th century, from earlier heyda (1520s), as exclamation; compare hey, hei and Swedish hej då. Sense “period of success, vigor” is a reanalysis as heyday based on unrelated day (as “period of time”) – compare day in the sun.
From Wiktionary, via Kaikki.org (CC BY-SA)