Etymology
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outage (n.)

"period or condition in which electrical power is disconnected," 1903, American English; formed from out on model of shortage.

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Definitions of outage

outage (n.)
the amount of something (as whiskey or oil) lost in storage or transportation;
outage (n.)
a temporary suspension of operation (as of computers);
there will be a network outage from 8 to 10 a.m.
From wordnet.princeton.edu