bailey
Synonym discussion
Sense: noun/1
Bailey is a specialised term for the courtyard inside a castle's outer wall — a word you will mostly find in history books, castle guides, and historical fiction. Courtyard is the everyday word for any open space surrounded by buildings; a school can have a courtyard, but only a castle has a bailey. Ward is a broader castle term used by historians to refer to a whole section or division of a castle (the inner ward, the outer ward), which may include multiple buildings and walls. Close refers to an enclosed area around a cathedral, college, or similar institution — it carries no military meaning. Compound describes a group of buildings inside a single enclosure, often for a specific community or purpose (a military compound, a diplomatic compound). If you are touring a castle, point to the open grassy area and say 'bailey'; if you are describing a hotel with a central open space, say 'courtyard.'
Etymology
Bailey comes from Middle English bailli, borrowed from Old French baille meaning 'enclosure' or 'palisade'. The Old French word likely traces back to Latin baculum ('stick, rod'), referring to the wooden stakes used to build early defensive fences. The word entered English after the Norman Conquest and settled into its current castle-architecture meaning by the 14th century.
First known use
14th century
14th century, in the meaning defined at sense 1