1. • noun - a large and stately mansion
   • 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 - interchanging the positions of the king and a rook
   • verb - move the king two squares toward a rook and in the same move the rook to the square next past the king
2. • A large fortified building or group of buildings with thick walls, usually dominating the surrounding country.
   • A fortified stronghold converted to residential use.
   • A large, ornate building similar to or resembling a fortified stronghold.
   • A place of privacy, security, or refuge.
   • To move the king in chess from its own square two empty squares to one side and then, in the same move, bring the rook from that side to the square immediately past the new position of the king.
   • To place in or as if in a castle.
   • To move (the king in chess) by castling.
3. • v - to make a certain move in chess

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