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We found 36 dictionaries with English definitions that include the word a:
Click on the first link on a line below to go directly to a page where "a" is defined.

General (23 matching dictionaries)

1. -a, -a-, a-: Merriam-Webster.com [home, info]
2. -a, -a, -a, a-, a-, a-, a-: Oxford Learner's Dictionaries [home, info]
3. a-, a-: American Heritage Dictionary of the English Language [home, info]
4. a-: Collins English Dictionary [home, info]
5. a-, the-a: Wordnik [home, info]
6. A-, 'a, 'a', -a, -a-, a', a(n): Wiktionary [home, info]
7. a-: Webster's New World College Dictionary, 4th Ed. [home, info]
8. a-: The Wordsmyth English Dictionary-Thesaurus [home, info]
9. -a, a-: Dictionary.com [home, info]
10. a- (1), a- (2), a- (3), a (1), a (2): Online Etymology Dictionary [home, info]
11. a-: UltraLingua English Dictionary [home, info]
12. 'A, A-, A (Ayumi Hamasaki EP), A (Ayumi Hamasaki album), A (Bengali), A (Big Bang EP), A (Big Bang album), A (Big Bang single), A (Big Bang single album), A (Cass McCombs album), A (Cyrillic), A (EP), A (Jethro Tull album), A (Kannada film), A (New York City Subway service), A (Pretty Little Liars), A (Rainbow song), A (S-train), A (The Walking Dead), A (Usher album), A (Usher and Zaytoven album), A (album), A (band), A (disambiguation), A (film), A (grade), A (hangul), A (hieroglyph), A (kana), A (letter), A (motor yacht), A (musical note), A (programming language), A (sailing yacht), A (word), A (year), .a: Wikipedia, the Free Encyclopedia [home, info]
13. A-: Online Plain Text English Dictionary [home, info]
14. a-: Webster's Revised Unabridged, 1913 Edition [home, info]
15. A-: AllWords.com Multi-Lingual Dictionary [home, info]
16. a-: MyWord.info [home, info]
17. a-: Free Dictionary [home, info]
18. a-: Dictionary/thesaurus [home, info]
19. A: Dictionary.com [home, info]
20. A: Wordnik [home, info]
21. A: Dictionary.com [home, info]

Art (1 matching dictionary)

22. a-: A Cross Reference of Latin and Greek Elements [home, info]

Computing (1 matching dictionary)

23. A (digit): Encyclopedia [home, info]

Medicine (5 matching dictionaries)

24. A-, A (adenine), a-: MedTerms.com Medical Dictionary [home, info]
25. A-, a-: MedFriendly Glossary [home, info]
26. A-: GASTROLAB Digestive Dictionary [home, info]
27. A (digit), a-: Medical dictionary [home, info]
28. A-, A (adenine), a-: Drug Medical Dictionary [home, info]

Miscellaneous (1 matching dictionary)

29. A, A: AbbreviationZ [home, info]

Science (2 matching dictionaries)

30. a-: Glossary of Roots of Botanical Names [home, info]
31. A-: A Dictionary of Quaternary Acronyms and Abbreviations [home, info]

Slang (2 matching dictionaries)

32. The A: 1960's Slang [home, info]
33. A [Bill Clinton], A [blarney stone], the A: Urban Dictionary [home, info]

Sports (1 matching dictionary)

34. A-: Bicycle Glossary [home, info]

(Note: See as for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (As) ▸ noun:  a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar ▸ noun:  a United States territory on the eastern part of the island of Samoa ▸ adverb:  to the same degree (often followed by `as') ("Birds were singing and the child sang as sweetly") ▸ Also see as ▸ Word origin ▸ Words similar to a ▸ Usage examples for a ▸ Idioms related to a (New!) ▸ Popular adjectives describing a ▸ Words that often appear near a ▸ Rhymes of a ▸ Invented words related to a