Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The period of greatest popularity, success, or power; prime.

from The Century Dictionary.

  • An exclamation of cheerfulness, surprise, wonder, etc.
  • noun Highest vigor; full strength; acme.

from the GNU version of the Collaborative International Dictionary of English.

  • noun The time of triumph and exultation; hence, joy, high spirits, frolicsomeness; wildness.
  • interjection An expression of frolic and exultation, and sometimes of wonder.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A period of success, popularity or power; prime.
  • interjection A lively greeting.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the period of greatest prosperity or productivity

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Perhaps alteration of heyda, exclamation of pleasure, probably alteration of Middle English hey, hey.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Late 16th century, from earlier heyda (1520s), as exclamation – compare hey, hei. Sense “period of success, vigor” from 1751, which respelt as heyday based on unrelated day (as “period of time”) – compare day in the sun.

Examples

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