• synonyms


[thou-zuh ndth, -zuh ntth, -zuh nth]
  1. last in order of a series of a thousand.
  2. being one of a thousand equal parts.
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  1. a thousandth part, especially of one (1/1000).
  2. the thousandth member of a series.
  3. Also thousandth's place. (in decimal notation) the position of the third digit to the right of the decimal point.
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Origin of thousandth

First recorded in 1545–55; thousand + -th2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for thousandth


  1. (usually prenominal)
    1. being the ordinal number of 1000 in numbering or counting order, position, time, etc
    2. (as noun)the thousandth in succession
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    1. one of 1000 approximately equal parts of something
    2. (as modifier)a thousandth part
  1. one of 1000 equal divisions of a particular scientific quantitymillivolt Related prefix: milli-
  2. the fraction equal to one divided by 1000 (1/1000)
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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 thousandth


1550s, from thousand + -th (1).

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Online Etymology Dictionary, © 2010 Douglas Harper