1. (n.) A fortified residence, especially that of a prince or nobleman; a fortress.

2. (n.) Any strong, imposing, and stately mansion.

3. (n.) A small tower, as on a ship, or an elephant's back.

4. (n.) A piece, made to represent a castle, used in the game of chess; a rook.

5. (v. i.) To move the castle to the square next to king, and then the king around the castle to the square next beyond it, for the purpose of covering the king.

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