castle in the air

noun phrase
variants: or less commonly castle in Spain

Definition of castle in the air

: an impracticable project : daydream

First Known Use of castle in the air

1566, in the meaning defined above

Keep scrolling for more

Learn More about castle in the air

Time Traveler for castle in the air

Time Traveler

The first known use of castle in the air was in 1566

See more words from the same year

Statistics for castle in the air

Cite this Entry

“Castle in the air.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/castle%20in%20the%20air. Accessed 15 Jun. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on castle in the air

Thesaurus: All synonyms and antonyms for castle in the air

WORD OF THE DAY

Test Your Vocabulary

Name that Thing: Dog Breeds

Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!