Castle (proper noun) /ˈkɑːsəl/, /kɑːsl̩/
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(UK, rail transport) Castle class, a class of steam locomotives used on the GWR
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(UK, Durham University slang) University College, Durham, a constituent college located in Durham Castle
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(OS grid ref SU0122) A hamlet in Bowerchalke parish, south-west Wiltshire, England .
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A community (without a council) in Cardiff, Wales; it includes Cardiff Castle.
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A community (without a council) in Swansea, Wales; it includes Swansea Castle.
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A town in Okfuskee County, Oklahoma, United States, derived from the surname.
castle (noun) /ˈkæsəl/, /kæsl̩/
1
A large residential building or compound that is fortified and contains many defences; in previous ages often inhabited by a nobleman or king. Also, a house or mansion with some of the architectural features of medieval castles.
2
(chess) An instance of castling.
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(chess, informal) A rook; a chess piece shaped like a castle tower.
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(shogi) A defense structure in shogi formed by defensive pieces surrounding the king.
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(cricket, colloquial) The wicket.
castle (verb) /ˈkæsəl/, /kæsl̩/
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(transitive) To house or keep in a castle.
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(transitive, figurative) To protect or separate in a similar way.
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(usually intransitive, chess) To move the king 2 squares right or left and, in the same turn, the nearest rook to the far side of the king. The move now has special rules: the king cannot be in, go through, or end in check; the squares between the king and rook must be vacant; and neither piece may have been moved before castling.
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(usually intransitive, shogi) To create a similar defensive position in Japanese chess through several moves.
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(cricket) To bowl a batsman with a full-length ball or yorker such that the stumps are knocked over.