noun
darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft)
• Topics: ↑aircraft
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\\ˈ ̷ ̷ˌ ̷ ̷\ noun (-s)Etymology: dim out
: a restriction limiting the use of lighting or the showing of lights at night especially during the threat of an air raid; also : a condition of partial darkness produced by such restriction
the continuing crisis gradually imposes a dimout on the sources and channels of public information — H.D.Lasswell
— compare blackout
Useful english dictionary. 2012.