Usually means: Imaginary, unrealistic plans or dreams.
Definitions Related words Mentions
We found 15 dictionaries that define the word castle in the air:

General (14 matching dictionaries)
  1. castle in the air: Merriam-Webster
  2. castle in the air: Collins English Dictionary
  3. castle in the air: Vocabulary.com
  4. castle in the air: Wordnik
  5. castle in the air: Wiktionary
  6. castle in the air: The Wordsmyth English Dictionary-Thesaurus
  7. castle in the air: Infoplease Dictionary
  8. Castle in the air, castle in the air: Dictionary.com
  9. Castle in the Air (film), Castle in the Air (novel), Castle in the Air: Wikipedia, the Free Encyclopedia
  10. castle in the air: Rhymezone
  11. Castle in the Air: Dictionary of Phrase and Fable (1898)
  12. castle in the air: FreeDictionary.org
  13. castle in the air: Mnemonic Dictionary
  14. castle in the air: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. castle in the air: Encyclopedia

(Note: See castle_in_the_airs as well.)

Definitions from Wiktionary (castle in the air)

noun:  (idiomatic) A desire, idea, or plan that is unlikely to ever be realized; a visionary project or scheme; a daydream, an idle fancy, a near impossibility.

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