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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 dictionaries 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 dictionaries Art (1 matching dictionary)
  1. Billion: Numismatic Dictionary [home, info]

Business dictionaries Business (1 matching dictionary)
  1. billion: BusinessDictionary.com [home, info]

Computing dictionaries Computing (2 matching dictionaries)
  1. billion: CCI Computer [home, info]
  2. Billion (disambiguation), billion: Encyclopedia [home, info]

Miscellaneous dictionaries Miscellaneous (1 matching dictionary)
  1. billion: Wordcraft Dictionary [home, info]

Science dictionaries Science (7 matching dictionaries)
  1. Billion: Eric Weisstein's World of Mathematics [home, info]
  2. billion: MATH SPOKEN HERE! [home, info]
  3. Billion: Extragalactic Astronomy [home, info]
  4. billion: Nine Planets Glossary [home, info]
  5. billion: Dictionary of Geology [home, info]
  6. billion (bn or B): How Many? A Dictionary of Units of Measurement [home, info]
  7. BILLION: Zoom Astronomy Glossary [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. Billion: Urban Dictionary [home, info]

Tech dictionaries Tech (2 matching dictionaries)
  1. Billion: Basics of Space Flight Glossary [home, info]
  2. BILLION: Lake and Water Word Glossary [home, info]

(Note: See billionth for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

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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
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Phrases that include billion:   billion dollar grass, billion cubic feet, billion laughs attack, multi billion, $2 billion arms deal, more...

Words similar to billion:   1000000000, 1000000000000, billionth, a billion, one million million, one thousand million, more...

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