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We found 41 dictionaries with English definitions that include the word why:
Click on the first link on a line below to go directly to a page where "why" is defined.

General (34 matching dictionaries)

1. why: Merriam-Webster.com [home, info]
2. why, why: Oxford Learner's Dictionaries [home, info]
3. why: American Heritage Dictionary of the English Language [home, info]
4. why: Collins English Dictionary [home, info]
5. why: Vocabulary.com [home, info]
6. why, why: Macmillan Dictionary [home, info]
7. WHy, Why, Why, why: Wordnik [home, info]
8. why: Cambridge Advanced Learner's Dictionary [home, info]
9. why: Wiktionary [home, info]
10. why: Webster's New World College Dictionary, 4th Ed. [home, info]
11. why: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. why: Infoplease Dictionary [home, info]
13. why: Dictionary.com [home, info]
14. why: Online Etymology Dictionary [home, info]
15. why: UltraLingua English Dictionary [home, info]
16. why: Cambridge Dictionary of American English [home, info]
17. why: Cambridge International Dictionary of Idioms [home, info]
18. Why (3T song), Why (Andy Gibb song), Why (Annie Lennox song), Why (Baby V.O.X), Why (Baby V.O.X album), Why (Carly Simon song), Why (Cathy Dennis song), Why (Frankie Avalon song), Why (Gabrielle song), Why (Godsmack song), Why (Jadakiss song), Why (Jason Aldean song), Why (Jieqiong song), Why (Lionel Richie song), Why (Mary J. Blige song), Why (Must We Fall in Love), Why (NF song), Why (Prudence Liew album), Why (Rascal Flatts song), Why (Sabrina Carpenter song), Why (Taeyeon EP), Why (Taeyeon song), Why (The Byrds song), Why (Tony Sheridan song), Why (board game), Why: Wikipedia, the Free Encyclopedia [home, info]
19. Why: Online Plain Text English Dictionary [home, info]
20. why: Webster's Revised Unabridged, 1913 Edition [home, info]
21. why: Rhymezone [home, info]
22. why: AllWords.com Multi-Lingual Dictionary [home, info]
23. why: Webster's 1828 Dictionary [home, info]
24. WHY: Stammtisch Beau Fleuve Acronyms [home, info]
25. why: All About Homonyms [home, info]
26. why: Free Dictionary [home, info]
27. why: Mnemonic Dictionary [home, info]
28. why: WordNet 1.7 Vocabulary Helper [home, info]
29. why: LookWAYup Translating Dictionary/Thesaurus [home, info]
30. why: Dictionary/thesaurus [home, info]
31. why: Wikimedia Commons US English Pronunciations [home, info]
32. Why: Wordnik [home, info]

Medicine (1 matching dictionary)

33. why: online medical dictionary [home, info]

Miscellaneous (4 matching dictionaries)

34. WHY: Acronym Finder [home, info]
35. WHY: Three Letter Words with definitions [home, info]
36. WHY: AbbreviationZ [home, info]
37. why: Idioms [home, info]

Science (1 matching dictionary)

38. Why: Misunderstood Physics Terms [home, info]

Slang (1 matching dictionary)

39. WHY, Why: Urban Dictionary [home, info]

(Note: See whys for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (why) ▸ noun:  the cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores' ▸ adverb:  question word; what is the reason (`how come' is a nonstandard variant) ("Why are you here?") ▸ name:  A surname (very rare: popularity rank in the U.S.: #66501) ▸ Also see whys ▸ Word origin ▸ Words similar to why ▸ Usage examples for why ▸ Idioms related to why (New!) ▸ Popular adjectives describing why ▸ Words that often appear near why ▸ Rhymes of why ▸ Invented words related to why