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We found 38 dictionaries with English definitions that include the word heyday:
Click on the first link on a line below to go directly to a page where "heyday" is defined.

General (33 matching dictionaries)

1. heyday: Merriam-Webster.com [home, info]
2. heyday: Oxford Dictionaries [home, info]
3. heyday: American Heritage Dictionary of the English Language [home, info]
4. heyday: Collins English Dictionary [home, info]
5. heyday: Vocabulary.com [home, info]
6. heyday: Macmillan Dictionary [home, info]
7. Heyday, heyday: Wordnik [home, info]
8. heyday: Cambridge Advanced Learner's Dictionary [home, info]
9. heyday: Wiktionary [home, info]
10. heyday: Webster's New World College Dictionary, 4th Ed. [home, info]
11. heyday: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. heyday: Infoplease Dictionary [home, info]
13. Heyday, heyday: Dictionary.com [home, info]
14. heyday: Online Etymology Dictionary [home, info]
15. heyday: UltraLingua English Dictionary [home, info]
16. heyday: Cambridge Dictionary of American English [home, info]
17. Heyday (Fairport Convention album), Heyday (The Church album), Heyday (novel), Heyday: Wikipedia, the Free Encyclopedia [home, info]
18. Heyday: Online Plain Text English Dictionary [home, info]
19. heyday: Webster's Revised Unabridged, 1913 Edition [home, info]
20. heyday: Rhymezone [home, info]
21. heyday: AllWords.com Multi-Lingual Dictionary [home, info]
22. heyday: Webster's 1828 Dictionary [home, info]
23. heyday: Free Dictionary [home, info]
24. heyday: Hutchinson Dictionaries [home, info]
25. heyday: The Phrontistery - A Dictionary of Obscure Words [home, info]
26. heyday: Mnemonic Dictionary [home, info]
27. heyday: WordNet 1.7 Vocabulary Helper [home, info]
28. heyday: LookWAYup Translating Dictionary/Thesaurus [home, info]
29. Heyday: The Word Detective [home, info]
30. heyday: Dictionary/thesaurus [home, info]
31. heyday: Wikimedia Commons US English Pronunciations [home, info]

Business (1 matching dictionary)

32. heyday: Legal dictionary [home, info]

Computing (1 matching dictionary)

33. heyday: Encyclopedia [home, info]

Medicine (1 matching dictionary)

34. heyday: online medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

35. heyday: Wordcraft Dictionary [home, info]

Slang (1 matching dictionary)

36. heyday: Urban Dictionary [home, info]

(Note: See heydays for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (heyday) ▸ noun:  the period of greatest prosperity or productivity ▸ Also see heydays ▸ Word origin ▸ Words similar to heyday ▸ Usage examples for heyday ▸ Popular adjectives describing heyday ▸ Words that often appear near heyday ▸ Rhymes of heyday ▸ Invented words related to heyday