Try Our Apps


Avoid these words. Seriously.


a combining form meaning “thousand” (millipede): in the metric system, used in the names of units equal to one thousandth of the given base unit (millimeter).
Origin of milli-
< French < Latin, combining form of mille thousand Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
British Dictionary definitions for milli-


denoting 10–3: millimetre, m
Word Origin
from French, from Latin mille thousand, this meaning being maintained in words borrowed from Latin (millipede)
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
Cite This Source
Word Origin and History for milli-

word-forming element meaning "thousandth part of a metric unit," from comb. form of Latin mille "thousand" (see million).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
milli- in Medicine

milli- pref.
One thousandth (10-3): millisecond.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
milli- in Science
A prefix that means "one thousandth," as in millimeter, one thousandth of a meter.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Nearby words for milli-

Difficulty index for milli-

Few English speakers likely know this word

Word Value for milli

Scrabble Words With Friends