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We found 23 dictionaries with English definitions that include the word billionth:
Click on the first link on a line below to go directly to a page where "billionth" is defined.

General dictionaries General (21 matching dictionaries)
  1. billionth: Oxford Dictionaries [home, info]
  2. billionth: American Heritage Dictionary of the English Language [home, info]
  3. billionth: Collins English Dictionary [home, info]
  4. billionth: Vocabulary.com [home, info]
  5. billionth: Macmillan Dictionary [home, info]
  6. billionth: Merriam-Webster's Online Dictionary, 11th Edition [home, info]
  7. Billionth, billionth: Wordnik [home, info]
  8. billionth: Cambridge Advanced Learner's Dictionary [home, info]
  9. billionth: Wiktionary [home, info]
  10. billionth: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. billionth: Dictionary.com [home, info]
  12. billionth: UltraLingua English Dictionary [home, info]
  13. Billionth: Wikipedia, the Free Encyclopedia [home, info]
  14. billionth: Rhymezone [home, info]
  15. billionth: Free Dictionary [home, info]
  16. billionth: Mnemonic Dictionary [home, info]
  17. billionth: WordNet 1.7 Vocabulary Helper [home, info]
  18. billionth: LookWAYup Translating Dictionary/Thesaurus [home, info]
  19. billionth: Dictionary/thesaurus [home, info]

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

Computing dictionaries Computing (1 matching dictionary)
  1. billionth: Encyclopedia [home, info]

(Note: See billion for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (billionth)

noun:  position 1,000,000,000 in a countable series of things
noun:  one part in a billion
adjective:  the ordinal number of one billion in counting order

▸ Also see billion

Phrases that include billionth:   one billionth, seven billionth human

Words similar to billionth:   billion, one-billionth, more...

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