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[mil-yuh nth] /ˈmɪl yənθ/
coming last in a series of a million.
being one of a million equal parts.
the millionth member of a series.
a millionth part, especially of one (1/1,000,000).
Origin of millionth
First recorded in 1665-75; million + -th2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for millionth
Contemporary Examples
  • For the millionth time the picture served to show how mesmerizingly crisp Obama always looks.

    The Heat Quotient Tina Brown October 28, 2008
Historical Examples
  • If I said I loved you it wouldn't be a millionth part of what I do.

    The Prisoner Alice Brown
  • And then I thought for the millionth time what an awful mistake it is to be fastidious.

    A Boswell of Baghdad E. V. Lucas
  • That's three-millionths of a millionth of a ampere-second at one volt.

    The Machine That Saved The World William Fitzgerald Jenkins
  • It'll do it all in about a millionth of a second, too—I want to get us all back alive if possible!

    Skylark Three Edward Elmer Smith
  • Then for the millionth part of a second their eyes met, and they recognised each other.

    Scarlet and Hyssop E. F. Benson
  • The millionth chance that it might not be locked was against him.

  • In this way a speed of a millionth of a second can be attained.

  • The dimensions of atoms must be less than a millionth of a millimetre in diameter.

    Urania Camille Flammarion
  • An increment of growth so minute as a millionth part of a mm.

    Life Movements in Plants Sir Jagadis Chunder Bose
British Dictionary definitions for millionth


  1. one of 1 000 000 approximately equal parts of something
  2. (as modifier): a millionth part
one of 1 000 000 equal divisions of a particular scientific quantity related prefix micro-
the fraction equal to one divided by 1 000 000
(usually prenominal)
  1. being the ordinal number of 1 000 000 in numbering or counting order, etc
  2. (as noun): the millionth to be manufactured
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for millionth

1670s, from million + -th (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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