Castle definition

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

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.

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A place of privacy, security, or refuge.
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A large fortified building or group of buildings with thick walls, usually dominating the surrounding country.
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A fortified stronghold converted to residential use.
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A large ornate building similar to or resembling a fortified stronghold.
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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.
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To place in or as if in a castle.
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noun
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To put into, or furnish with, a castle.
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(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.
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To castle a king.
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A surname​.
pronoun
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(games) To move (the king in chess) by castling.
verb
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A safe, secure place; refuge.
noun
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Any massive dwelling somewhat like this.
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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.

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.

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Other Word Forms

Noun

Singular:
castle
Plural:
castles

Origin of castle

  • Middle English castel from Old English and from Norman French both from Latin castellum diminutive of castrum kes- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition