malfunction

[mal-fuhngk-shuhn]
noun
1.
failure to function properly: a malfunction of the liver; the malfunction of a rocket.
verb (used without object)
2.
to fail to function properly.

Origin:
1925–30; mal- + function

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World English Dictionary
malfunction (mælˈfʌŋkʃən)
 
vb
1.  (intr) to function imperfectly or irregularly or fail to function
 
n
2.  failure to function or defective functioning

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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Etymonline
Word Origin & History

malfunction
1928, from mal- "bad, badly, wrong" (see mal-) + function (q.v.). Related: Malfunctioning.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

malfunction mal·func·tion (māl-fŭngk'shən)
v. mal·func·tioned, mal·func·tion·ing, mal·func·tions

  1. To fail to function.

  2. To function improperly.

n.
  1. Failure to function.

  2. Faulty or abnormal functioning.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The investigators acknowledge that they have no evidence pointing to a
  mechanical malfunction.
Officials say the explosion was caused by an electrical malfunction.
En route to the hangar, the shuttle's crawler-transporter had suffered a
  malfunction.
The sun may have cooked the batteries, causing them to malfunction.
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