heyday
hey·day
noun
1.
the period of greatest prosperity or productivity
Origin
Late 16th century, from earlier heyda (1520s), as exclamation - compare hey, hei. Sense “period of success, vigor” is a respelling as heyday based on unrelated day (as “period of time”) - compare day in the sun.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.