'Mirage' definitions:

Definition of 'mirage'

From: WordNet
noun
An optical illusion in which atmospheric refraction by a layer of hot air distorts or inverts reflections of distant objects
noun
Something illusory and unattainable

Definition of 'Mirage'

From: GCIDE
  • Mirage \Mi`rage"\, n. [F., fr. mirer to look at carefully, to aim, se mirer to look at one's self in a glass, to reflect, to be reflected, LL. mirare to look at. See Mirror.] An optical effect, sometimes seen on the ocean, but more frequently in deserts, due to total reflection of light at the surface common to two strata of air differently heated. The reflected image is seen, commonly in an inverted position, while the real object may or may not be in sight. When the surface is horizontal, and below the eye, the appearance is that of a sheet of water in which the object is seen reflected; when the reflecting surface is above the eye, the image is seen projected against the sky. The {fata Morgana} and looming are species of mirage. [1913 Webster]
  • By the mirage uplifted the land floats vague in the ether, Ships and the shadows of ships hang in the motionless air. --Longfellow. [1913 Webster]

Synonyms of 'mirage'

From: Moby Thesaurus