Definition of mirage
1
: an optical (see optical sense 2a) effect that is sometimes seen at sea, in the desert, or over a hot pavement, that may have the appearance of a pool of water or a mirror in which distant objects are seen inverted, and that is caused by the bending or reflection of rays of light by a layer of heated air of varying density
2
: something illusory and unattainable like a mirage
A peaceful solution proved to be a mirage.
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Merriam-Webster unabridged
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Time Traveler for mirage
The first known use of mirage was in 1800
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