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We found 47 dictionaries with English definitions that include the word billion:
Click on the first link on a line below to go directly to a page where "billion" is defined.

General (32 matching dictionaries)

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

Art (1 matching dictionary)

31. Billion: Numismatic Dictionary [home, info]

Business (1 matching dictionary)

32. billion: BusinessDictionary.com [home, info]

Computing (2 matching dictionaries)

33. billion: CCI Computer [home, info]
34. Billion (disambiguation), billion: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

35. billion: Wordcraft Dictionary [home, info]

Science (7 matching dictionaries)

36. Billion: Eric Weisstein's World of Mathematics [home, info]
37. billion: MATH SPOKEN HERE! [home, info]
38. Billion: Extragalactic Astronomy [home, info]
39. billion: Nine Planets Glossary [home, info]
40. billion: Dictionary of Geology [home, info]
41. billion (bn or B): How Many? A Dictionary of Units of Measurement [home, info]
42. BILLION: Zoom Astronomy Glossary [home, info]

Slang (1 matching dictionary)

43. Billion: Urban Dictionary [home, info]

Tech (2 matching dictionaries)

44. Billion: Basics of Space Flight Glossary [home, info]
45. BILLION: Lake and Water Word Glossary [home, info]

(Note: See billionth for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (billion) ▸ noun:  the number that is represented as a one followed by 9 zeros ▸ noun:  the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen ▸ adjective:  denoting a quantity consisting of one thousand million items or units in the United States ▸ adjective:  denoting a quantity consisting of one million million items or units in Great Britain ▸ Also see billionth ▸ Word origin ▸ Words similar to billion ▸ Usage examples for billion ▸ Popular adjectives describing billion ▸ Popular nouns described by billion ▸ Words that often appear near billion ▸ Rhymes of billion ▸ Invented words related to billion