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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