Meaning of “castle” in the English Dictionary

"castle" in British English

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castlenoun [ C ]

uk /ˈkɑː.səl/ us /ˈkæs.əl/

A2 a large strong building, built in the past by a ruler or important person to protect the people inside from attack

informal for rook noun

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castleverb [ I ]

uk /ˈkɑː.səl/ us /ˈkæs.əl/ specialized

(Definition of “castle” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"castle" in American English

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castlenoun [ C ]

us /ˈkæs·əl/

a large building with strong walls, built in the past by a king or other important person for protection against attack

A castle is also a rook.

(Definition of “castle” from the Cambridge Academic Content Dictionary © Cambridge University Press)