a unit of time equal to one millionth of a second. Symbol: μsec

1905–10; micro- + second2

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World English Dictionary
microsecond (ˈmaɪkrəʊˌsɛkənd)
μs one millionth 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

1906, from micro- + second (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
microsecond   (mī'krō-sěk'ənd)  Pronunciation Key 
A unit of time equal to one millionth (10-6) of a second.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

microsecond definition

One millionth (10^-6) of a second.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The body is always trying to restore health every microsecond of our lives.
When you're dancing with an enormous machine, it's even more important to get
  the timing correct, down to the microsecond.
As the early universe went along doubling every microsecond, the stuff in it
  doubled, too-out of nowhere.
In contrast, you can look at a plot in a microsecond, and quickly scan between
  interesting features.
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