Definitions from Wiktionary ( )

▸ noun:  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.
▸ noun:  (chess) An instance of castling.
▸ noun:  (chess, informal) A rook; a chess piece shaped like a castle tower.
▸ noun:  (shogi) A defense structure in shogi formed by defensive pieces surrounding the king.
▸ noun:  (obsolete) A close helmet.
▸ noun:  (dated) Any strong, imposing, and stately palace or mansion.
▸ noun:  (dated) A small tower, as on a ship, or an elephant's back.
▸ noun:  (cricket, colloquial) The wicket.
▸ verb:  (transitive) To house or keep in a castle.
▸ verb:  (transitive, figurative) To protect or separate in a similar way.
▸ verb:  (obsolete) To make into a castle: to build in the form of a castle or add (real or imitation) battlements to an existing building.
▸ verb:  (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.
▸ verb:  (usually intransitive, shogi) To create a similar defensive position in Japanese chess through several moves.
▸ verb:  (cricket) To bowl a batsman with a full-length ball or yorker such that the stumps are knocked over.
▸ noun:  (countable) A surname transferred from the common noun referring to someone who lived in or worked in a castle
▸ noun:  (UK, rail transport) Castle class, a class of steam locomotives used on the GWR
▸ noun:  (UK, Durham University slang) University College, Durham, a constituent college located in Durham Castle
▸ noun:  A place name:
▸ noun:  A hamlet in Bowerchalke parish, south-west Wiltshire, England (OS grid ref SU0122).
▸ noun:  A community (without a council) in Cardiff, Wales; it includes Cardiff Castle.
▸ noun:  A community (without a council) in Swansea, Wales; it includes Swansea Castle.
▸ noun:  A town in Okfuskee County, Oklahoma, United States, derived from the surname.

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