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1. Thousandth.
2. Consisting of a thousandth.
3. Relating to thousandths.
A thousandth.

[From Latin mīllēsimus, from mīlle, thousand; see gheslo- in Indo-European roots.]

mil·les′i·mal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Mathematics)
a. denoting a thousandth
b. (as noun): a millesimal.
2. (Mathematics) of, consisting of, or relating to a thousandth
[C18: from Latin mīllēsimus]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(mɪˈlɛs ə məl)

adj. n.
2. a thousandth part.
[1710–20; < Latin millēsim(us) thousandth (mille thousand + -ēsimus ordinal suffix) + -al1]
mil•les′i•mal•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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By law, the traditional ckuk kam jewelry of the Hong Kong region of China must be of at least 990 millesimal fineness, that is, 99.0 percent pure gold.
Homeopathy, an innocuous and eco-friendly alternative, has been proposed to strengthen biological systems against diseases and uses dilutions from decimal (low-dilution) to millesimal (very high-dilution) potencies (Bellavite & Signorini, 2002).
In numerous European countries, the rates are determined according to the Millesimal fineness scale, which is getting in vogue as a fresh technique of measuring the rates and purity of gold.