one thousandth of a second. Abbreviation: msec

1905–10; milli- + second2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
millisecond (ˈmɪlɪˌsɛkənd)
ms one thousandth of a second

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"one thousandth of a second," 1922, from L. mille "a thousand" (see mile) + second (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

millisecond mil·li·sec·ond (mĭl'ĭ-sěk'ənd)

Abbr. ms, msec One thousandth (10-3) of a second.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

millisecond definition

(ms) One thousandth of a second, one thousand microseconds. A long time for a modern computer.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
In some cases these laws might not allow the universe to persist for more than
  a millisecond.
It is not clear that trading every millisecond serves that purpose.
It is his unequalled ability to capture a millisecond in time that partly
  defines his genius.
Then, he needed two hours of computer time to calculate a single cell's
  activity during a fraction of a millisecond.
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