CASTLE

Definition of CASTLE

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