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Line breaks: cas¦tle
Pronunciation: /ˈkɑːs(ə)l

Definition of castle in English:


1A large building, typically of the medieval period, fortified against attack with thick walls, battlements, towers, and often a moat: Edinburgh Castle the crumbling stonework of a ruined castle
More example sentences
  • Here, you can see stone cannon balls built into the castle walls, defensive battlements and interior living quarters.
  • I sat in the guard barracks in the outer wall of the castle battlements.
  • THE 5ft-thick walls of a medieval castle have seen the light of day again after centuries buried underground.
fortress, fort, stronghold, fortification, keep, citadel, fastness, tower, peel, palace, chateau, donjon;
in Spainalcazar
1.1A magnificent and imposing old mansion: [in names]: Castle Howard
More example sentences
  • Castle Howard is the property of the Howard family, while Harewood House and Burton Constable belong to trusts.
  • The real Grace Nugent been a near neighbor, living at Castle Nugent four miles north of Edgeworthstown.
  • Hopefully soon they would catch up to Ian's caravan, and would return to castle Laramont with Rana.
1.2 Chess , informal old-fashioned term for rook2.


[no object] (often as noun castling) Chess Back to top  
1Make a special move (no more than once in a game by each player) in which the king is transferred from its original square two squares along the back rank towards a rook on its corner square which is then transferred to the square passed over by the king.
Example sentences
  • Also, he would like to clear the back rank before he castles to give his Rooks greater maneuverability.
  • At this point I think Black could simply castle when once again I see nothing wrong with his position.
  • And White lost more than a tempo, more like two or three since it took five bishop and knight moves to make the captures and Black did not lose a tempo with castling and only made two capturing moves with his rook and king.
1.1 [with object] Move (the king) by castling.
Example sentences
  • ‘He's just a crybaby if you ask me,’ the other spat as he castled his king.
  • If White's King was castled, then 4.Nxd6 would be equal.
  • But if the kings are castled on opposite sides and the half-open file bears down on the enemy king, it's a big plus and can easily offset even doubled isolated pawns.


late Old English: from Anglo-Norman French and Old Northern French castel, from Latin castellum, diminutive of castrum 'fort'.


castles in the air (or in Spain)

Visionary unattainable schemes; daydreams: my father built castles in the air about owning a boat
More example sentences
  • The neurotic is the type of person who's continuously building dream castles in the air.
  • Please tell him just to gently post the mail into the box I have so willingly provided, and then tell him to be on his way, to beat his path away from my dreamy semi-consciousness, and leave me to my somnolence, my reverie of castles in the air.
  • if you have built castles in the air, your work need not be lost; that is where they should be. now put the foundations under them.



adjective ( archaic )
Example sentences
  • Each of the worlds that you fly in are unique, from barren wastelands and deserts to a castled city to flying through ice caverns or a volcano.

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