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We found 42 dictionaries with English definitions that include the word once:
Click on the first link on a line below to go directly to a page where "once" is defined.

General (34 matching dictionaries)

1. once: Merriam-Webster.com [home, info]
2. once: Oxford Learner's Dictionaries [home, info]
3. once: American Heritage Dictionary of the English Language [home, info]
4. once: Collins English Dictionary [home, info]
5. once: Vocabulary.com [home, info]
6. once: Macmillan Dictionary [home, info]
7. Once: Wordnik [home, info]
8. the once: Cambridge Advanced Learner's Dictionary [home, info]
9. once: Wiktionary [home, info]
10. once: Webster's New World College Dictionary, 4th Ed. [home, info]
11. once: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. once: Infoplease Dictionary [home, info]
13. Once, once: Dictionary.com [home, info]
14. once: Online Etymology Dictionary [home, info]
15. once: UltraLingua English Dictionary [home, info]
16. once: Cambridge Dictionary of American English [home, info]
17. once: Cambridge International Dictionary of Idioms [home, info]
18. ONCE (cycling team), ONCE, Once (Diana Vickers song), Once (Liam Gallagher song), Once (Morris Gleitzman novel), Once (Nightwish album), Once (Pearl Jam song), Once (Roy Harper album), Once (TV series), Once (The Tyde album), Once (film), Once (musical), Once (novel), Once (singer), Once (song), Once (soundtrack), Once, The Once: Wikipedia, the Free Encyclopedia [home, info]
19. Once: Online Plain Text English Dictionary [home, info]
20. once: Webster's Revised Unabridged, 1913 Edition [home, info]
21. once: Rhymezone [home, info]
22. once, once, once (f): AllWords.com Multi-Lingual Dictionary [home, info]
23. once: Webster's 1828 Dictionary [home, info]
24. ONCE: Stammtisch Beau Fleuve Acronyms [home, info]
25. once: Free Dictionary [home, info]
26. once: Mnemonic Dictionary [home, info]
27. once: WordNet 1.7 Vocabulary Helper [home, info]
28. once: LookWAYup Translating Dictionary/Thesaurus [home, info]
29. once: Dictionary/thesaurus [home, info]
30. once: Wikimedia Commons US English Pronunciations [home, info]
31. Once, once: Wordnik [home, info]
32. once: Cambridge Advanced Learner's Dictionary [home, info]

Art (1 matching dictionary)

33. ONCE: Shakespeare Glossary [home, info]

Business (1 matching dictionary)

34. Once (album), once: Legal dictionary [home, info]

Medicine (1 matching dictionary)

35. once: online medical dictionary [home, info]

Miscellaneous (4 matching dictionaries)

36. ONCE: Navajo Code Talkers' Dictionary [home, info]
37. ONCE: Acronym Finder [home, info]
38. ONCE: AbbreviationZ [home, info]
39. once: Idioms [home, info]

Slang (1 matching dictionary)

40. once: Urban Dictionary [home, info]

(Note: See onces for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (once) ▸ adverb:  on one occasion ("Once I ran into her") ▸ adverb:  at a previous time ("Once he loved her") ▸ adverb:  as soon as ("Once we are home, we can rest") ▸ Also see onces ▸ Word origin ▸ Words similar to once ▸ Usage examples for once ▸ Idioms related to once (New!) ▸ Words that often appear near once ▸ Rhymes of once ▸ Invented words related to once