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English definition of “castle”

castle

noun [C]     /ˈkɑː.sl̩/ US  /ˈkæs.l̩/
A2 a large strong building , built in the past by a ruler or important person to protect the people inside from attack Fortifications informal for rook nounChess
(Definition of castle noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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