Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “castle”

castle

noun   /ˈkæs·əl/
A2 a large, strong building that was built in the past to protect the people inside from being attacked
(Definition of castle noun from the Webster's Essential Mini Dictionary © Cambridge University Press)

Definitions of “castle” in other dictionaries

Word of the Day

beneficiary

a person or group who receives money, advantages, etc. as a result of something else

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More