- The definition of a citadel is a place where people go for safety or to defend.
A medieval castle is an example of a citadel.
This castle is a citadel.
citadel definition by Webster's New World
- a fortress on a commanding height for defense of a city
- a fortified place; stronghold
- a place of safety; refuge
Origin: ; from Italian cittadella, diminutive of cittade, city ; from Classical Latin civitas, citizenship: see city
citadel definition by American Heritage Dictionary
- A fortress in a commanding position in or near a city.
- A stronghold or fortified place; a bulwark.
Origin: French citadelle, from Italian cittadella, diminutive of città, city, from Latin cīvitās; see city.