1. An optical illusion caused by atmospheric conditions, typically seen as a shimmering image of water or objects in the distance, especially in deserts or on hot roads
The traveler thought he saw an oasis, but it was just a mirage.
O viajante pensou que via um oásis, mas era apenas uma miragem.
2. Something that appears real or possible but is actually impossible to achieve; an illusion or false hope
His promise of wealth turned out to be a mirage.
Sua promessa de riqueza acabou sendo uma miragem.