castle in the air definition

  • noun:
    • A visionary project or scheme; a day-dream; an idle fancy; a pipe dream; any program, need, or indisputable fact that is not likely to be previously understood; a near impossibility.
    • a visionary project; a baseless scheme; an air castle; -- sometimes called a castle in Spain (F. Ch√Ęteau en Espagne).
    • absentminded dreaming while awake

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