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Noun castle has 4 senses
- palace, castle - a large and stately mansion
--1 is a kind of mansion, mansion house, manse, hall, residence
--1 has parts: great hall
--1 has particulars: Buckingham Palace
- castle - a large building formerly occupied by a ruler and fortified against attack
--2 is a kind of fortification, munition
--2 has parts: keep, donjon, dungeon; turret
--2 has particulars: Balmoral Castle
- castle, rook - (chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard
--3 is a kind of chessman, chess piece
- castle, castling - interchanging the positions of the king and a rook
--4 is a kind of chess move