#1 castle n. [palace] a large and stately mansion. wn
#2 castle n. a large building formerly occupied by a ruler and fortified against attack. wn
#3 castle v. move the king two squares toward a rook and in the same move the rook to the square next past the king. wn
#4 castle n. [rook] (chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard. wn
#5 castle n. [castling] interchanging the positions of the king and a rook. wn
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