SynonymDefinitionAntonym.com - English Synonym Dictionary

Interchanging the positions of the king and a rook

A large building formerly occupied by a ruler and fortified against attack

(chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard

A large and stately mansion

Move the king two squares toward a rook and in the same move the rook to the square next past the king