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We found 37 dictionaries with English definitions that include the word onset:
Click on the first link on a line below to go directly to a page where "onset" is defined.

General (29 matching dictionaries)

1. onset: Merriam-Webster.com [home, info]
2. onset: Oxford Learner's Dictionaries [home, info]
3. onset: American Heritage Dictionary of the English Language [home, info]
4. onset: Collins English Dictionary [home, info]
5. onset: Vocabulary.com [home, info]
6. onset: Macmillan Dictionary [home, info]
7. Onset, onset: Wordnik [home, info]
8. onset: Cambridge Advanced Learner's Dictionary [home, info]
9. onset: Wiktionary [home, info]
10. onset: Webster's New World College Dictionary, 4th Ed. [home, info]
11. onset: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. onset: Infoplease Dictionary [home, info]
13. onset: Dictionary.com [home, info]
14. onset (n.): Online Etymology Dictionary [home, info]
15. Onset, onset: UltraLingua English Dictionary [home, info]
16. onset: Cambridge Dictionary of American English [home, info]
17. Onset (audio), Onset, The Onset: Wikipedia, the Free Encyclopedia [home, info]
18. Onset: Online Plain Text English Dictionary [home, info]
19. onset: Webster's Revised Unabridged, 1913 Edition [home, info]
20. onset: Rhymezone [home, info]
21. onset: AllWords.com Multi-Lingual Dictionary [home, info]
22. onset: Webster's 1828 Dictionary [home, info]
23. onset: Free Dictionary [home, info]
24. onset: Mnemonic Dictionary [home, info]
25. onset: WordNet 1.7 Vocabulary Helper [home, info]
26. onset: LookWAYup Translating Dictionary/Thesaurus [home, info]
27. onset: Dictionary/thesaurus [home, info]

Art (2 matching dictionaries)

28. onset: Linguistic Glossary [home, info]
29. Onset: Lexicon of Linguistics [home, info]

Business (1 matching dictionary)

30. onset: Legal dictionary [home, info]

Computing (1 matching dictionary)

31. onset: Encyclopedia [home, info]

Medicine (3 matching dictionaries)

32. Onset: MedTerms.com Medical Dictionary [home, info]
33. onset: Medical dictionary [home, info]
34. Onset: Drug Medical Dictionary [home, info]

Miscellaneous (1 matching dictionary)

35. OnSET: Acronym Finder [home, info]

(Note: See onsets for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (onset) ▸ noun:  the beginning or early stages ("The onset of pneumonia") ▸ noun:  (military) an offensive against an enemy (using weapons) ▸ Also see onsets ▸ Word origin ▸ Words similar to onset ▸ Usage examples for onset ▸ Idioms related to onset (New!) ▸ Popular adjectives describing onset ▸ Words that often appear near onset ▸ Rhymes of onset ▸ Invented words related to onset