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We found 33 dictionaries with English definitions that include the word upon:
Click on the first link on a line below to go directly to a page where "upon" is defined.

General (29 matching dictionaries)

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

Medicine (1 matching dictionary)

28. upon: online medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

29. UPoN: Acronym Finder [home, info]
30. upon: Idioms [home, info]

Slang (1 matching dictionary)

31. upon: Urban Dictionary [home, info]

Quick definitions from Macmillan ( ) Provided by ▸ Word origin ▸ Words similar to upon ▸ Usage examples for upon ▸ Idioms related to upon (New!) ▸ Words that often appear near upon ▸ Rhymes of upon ▸ Invented words related to upon