From Old East Slavic *мьчьта* (mĭčĭta), meaning a fleeting vision or fantasy. Related to the verb *мчаться* ("to rush, to fly"), evoking the idea of thoughts that speed away into imagination. The word has been in common use since at least the 18th century, when Russian Romantic literature elevated the concept of the cherished dream to near-spiritual status.

In Russian culture, мечта carries a deeper, more soulful weight than the English word "dream." It specifically means a waking, conscious aspiration — not a sleeping dream (that's *сон*). The phrase *мечта всей жизни* ("the dream of one's whole life") is a common and heartfelt expression. Russian literature, from Pushkin to Chekhov, is filled with characters defined entirely by their мечта — often unattainable, which gives the word a faintly bittersweet, poetic flavour.