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We found 55 dictionaries with English definitions that include the word addition:
Click on the first link on a line below to go directly to a page where "addition" is defined.

General (30 matching dictionaries)

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

Art (5 matching dictionaries)

29. Addition (Add.): Dictionary of Philosophical Terms and Names [home, info]
30. Addition: Paris Cookbook [home, info]
31. Addition: Epicurus.com French Glossary [home, info]
32. Addition: Epicurus.com Food Glossary [home, info]
33. ADDITION: Shakespeare Glossary [home, info]

Business (3 matching dictionaries)

34. ADDITION: Bouvier's Law Dictionary 1856 Edition [home, info]
35. addition: Legal dictionary [home, info]
36. addition: BusinessDictionary.com [home, info]

Computing (1 matching dictionary)

37. addition: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

38. addition: online medical dictionary [home, info]
39. addition: Medical dictionary [home, info]

Miscellaneous (5 matching dictionaries)

40. ADDITION: Navajo Code Talkers' Dictionary [home, info]
41. addition: Encyclopedia of Graphic Symbols [home, info]
42. Addition: Brilliant Dream Dictionary [home, info]
43. addition: Sound-Alike Words [home, info]
44. addition: Idioms [home, info]

Science (6 matching dictionaries)

45. Addition: A Glossary of Mathematical Terms [home, info]
46. Addition: Eric Weisstein's World of Mathematics [home, info]
47. -addition (alpha-addition), addition: PHYSICAL ORGANIC CHEMISTRY [home, info]
48. addition: MATH SPOKEN HERE! [home, info]
49. addition, addition: PlanetMath Encyclopedia [home, info]
50. addition: FOLDOP - Free On Line Dictionary Of Philosophy [home, info]

Slang (1 matching dictionary)

51. The addition: Urban Dictionary [home, info]

Tech (2 matching dictionaries)

52. ADDITION: Energy Terms [home, info]
53. ADDITION: Glossary of Composite Terms [home, info]

(Note: See additions for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (addition) ▸ noun:  the act of adding one thing to another ("The addition of flowers created a pleasing effect") ▸ noun:  a component that is added to something to improve it ("The addition of a bathroom was a major improvement") ▸ noun:  a suburban area laid out in streets and lots for a future residential area ▸ noun:  a quantity that is added ("There was an addition to property taxes this year") ▸ noun:  the arithmetic operation of summing; calculating the sum of two or more numbers ▸ noun:  something added to what you already have ("He was a new addition to the staff") ▸ Also see additions ▸ Word origin ▸ Words similar to addition ▸ Usage examples for addition ▸ Idioms related to addition (New!) ▸ Popular adjectives describing addition ▸ Words that often appear near addition ▸ Rhymes of addition ▸ Invented words related to addition