billionth Hear it!

billionth definition

bil·lionth (bil′yənt̸h)

adjective

  1. coming last in a series of a billion
  2. designating any of the billion equal parts of something

noun

  1. the last in a series of a billion
  2. any of the billion equal parts of something

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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