Castle (District Electoral Area)
WordNet
noun
(1) Interchanging the positions of the king and a rook
(2) A large building formerly occupied by a ruler and fortified against attack
(3) (chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard
(4) A large and stately mansion
verb
(5) Move the king two squares toward a rook and in the same move the rook to the square next past the king