castle meaning and definition

CASTLE noun

Definition of castle (noun)

1. a large and stately mansion
   • synonyms: palace
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
   • synonyms: rook
4. interchanging the positions of the king and a rook
   • synonyms: castling

CASTLE verb

Definition of castle (verb)

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