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We found 28 dictionaries with English definitions that include the word ontario:
Click on the first link on a line below to go directly to a page where "ontario" is defined.

General (22 matching dictionaries)

1. Ontario: Merriam-Webster.com [home, info]
2. Ontario, Ontario: Oxford Dictionaries [home, info]
3. Ontario: American Heritage Dictionary of the English Language [home, info]
4. Ontario: Collins English Dictionary [home, info]
5. Ontario: Vocabulary.com [home, info]
6. Ontario, ontario: Wordnik [home, info]
7. Ontario: Wiktionary [home, info]
8. Ontario: Webster's New World College Dictionary, 4th Ed. [home, info]
9. Ontario: The Wordsmyth English Dictionary-Thesaurus [home, info]
10. Ontario: Infoplease Dictionary [home, info]
11. Ontario: Dictionary.com [home, info]
12. Ontario: Online Etymology Dictionary [home, info]
13. Ontario: UltraLingua English Dictionary [home, info]
14. Ontario (Amtrak station), Ontario (computer virus), Ontario (department store), Ontario (disambiguation), Ontario (electoral district), Ontario (mine), Ontario (wine), Ontario: Wikipedia, the Free Encyclopedia [home, info]
15. Ontario: Rhymezone [home, info]
16. Ontario: Encarta® Online Encyclopedia, North American Edition [home, info]
17. Ontario: 1911 edition of the Encyclopedia Britannica [home, info]
18. ontario: Free Dictionary [home, info]
19. ontario: Mnemonic Dictionary [home, info]
20. ontario: WordNet 1.7 Vocabulary Helper [home, info]
21. Ontario, ontario: LookWAYup Translating Dictionary/Thesaurus [home, info]
22. Ontario: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

23. Ontario (canada), Ontario: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

24. Ontario: Medical Dictionary [home, info]
25. ontario: online medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

26. ONTARIO: AbbreviationZ [home, info]

Slang (2 matching dictionaries)

27. Ontario: Totally Unofficial Rap [home, info]
28. Ontario: Urban Dictionary [home, info]

(Note: See ontarios for more definitions.)

Quick definitions from WordNet (Ontario) ▸ noun:  a prosperous and industrialized province in central Canada ▸ noun:  the smallest of the Great Lakes ▸ Also see ontarios ▸ Word origin ▸ Words similar to ontario ▸ Usage examples for ontario ▸ Popular adjectives describing ontario ▸ Words that often appear near ontario ▸ Rhymes of ontario ▸ Invented words related to ontario