Definitions of castle:
- noun: interchanging the positions of the king and a rook
- noun: a large building formerly occupied by a ruler and fortified against attack
- noun: (chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard
- noun: a large and stately mansion
- verb: move the king two squares toward a rook and in the same move the rook to the square next past the king
- name: A surname (common: 1 in 11111 families; popularity rank in the U.S.: #1430)
