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castle

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The definition of a castle is a large fortified building or set of buildings where royalty lives, or a large and impressive house.

(noun)

A fortified building with a moat and a draw bridge where the king lives is an example of a castle.
A huge impressive mansion is an example of a castle.

To castle is a move in chess involving the rook chess piece.

(verb)

An example of castle is to move the king piece two squares and place the nearest rook on the square which was jumped by the king.

See castle in Webster's New World College Dictionary

noun

a large building or group of buildings fortified with thick walls, battlements, and often a moat; castles were the strongholds of noblemen in the Middle Ages
any massive dwelling somewhat like this
a safe, secure place; refuge
Chess rook

Origin: ME < OE & Anglo-Fr castel < L castellum, dim. of castrum, fort

transitive verb castled, castling

to put into, or furnish with, a castle
Chess to move (a king) two squares to either side and then, in the same move, set the castle in the square skipped by the king: permitted only when neither piece has been moved before and the spaces between them are not occupied

intransitive verb

to castle a king

See castle in American Heritage Dictionary 4

noun

a. A large fortified building or group of buildings with thick walls, usually dominating the surrounding country.
b. A fortified stronghold converted to residential use.
c. A large ornate building similar to or resembling a fortified stronghold.
A place of privacy, security, or refuge.
Games See rook².

verb cas·tled, cas·tling, cas·tles

verb, intransitive
Games

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.

verb, transitive