• synonyms


[mil-yuh nth]
  1. coming last in a series of a million.
  2. being one of a million equal parts.
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  1. the millionth member of a series.
  2. a millionth part, especially of one (1/1,000,000).
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Origin of millionth

First recorded in 1665–75; million + -th2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for millionth

Contemporary Examples of millionth

Historical Examples of millionth

  • 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.

  • 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

British Dictionary definitions for millionth


    1. one of 1 000 000 approximately equal parts of something
    2. (as modifier)a millionth part
  1. one of 1 000 000 equal divisions of a particular scientific quantityRelated prefix: micro-
  2. the fraction equal to one divided by 1 000 000
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  1. (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
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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

Word Origin and History for millionth


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

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Online Etymology Dictionary, © 2010 Douglas Harper