Definition of chateau noun from the Oxford Advanced Learner's Dictionary

 

chateau

 noun
(also château)noun
BrE BrE//ˈʃætəʊ//
 
; NAmE NAmE//ʃæˈtoʊ//
 
(pl. chateaux, châteaux or chateaus, châteaus
BrE BrE//ˈʃætəʊz//
 
; NAmE NAmE//ʃæˈtoʊz//
 
)
(from French)
 
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a castle or large country house in France The Loire Valley is home to more than 300 chateaux. Word Origin mid 18th cent.: French, from Old French chastel from Latin castellum, diminutive of castrum ‘fort’.
See the Oxford Advanced American Dictionary entry: chateau