outage

[ou-tij]
noun
1.
an interruption or failure in the supply of power, especially electricity.
2.
the period during which power is lost: a two-hour outage on the East Coast.
3.
a stoppage in the functioning of a machine or mechanism due to a failure in the supply of power or electricity.
4.
the quantity of goods lost or lacking from a shipment. Compare innage ( def 1 ).
5.
Aeronautics. the amount of fuel used during a flight. Compare innage ( def 2 ).

Origin:
1900–05, Americanism; out + -age

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
outage (ˈaʊtɪdʒ)
 
n
1.  a quantity of goods missing or lost after storage or shipment
2.  a period of power failure, machine stoppage, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

outage
"period or condition in which electrical power is disconnected," 1903, Amer.Eng.; formed on model of shortage (see short).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It was the first major outage the service has suffered in months and possibly
  the first ever due to sabotage.
Once, during power outage, candidate shown rare-book stacks by flashlight.
The flashlight searching for the circuit breakers after a power outage.
The operators knew at once that the outage was citywide.
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