This is the 4465th most frequent Dutch word.
citadel
A fortress protecting a city or commanding a position.
Here, 'citadel' is used to denote a fortress or stronghold typically situated in a high position.
De oude citadel staat bovenop de heuvel en biedt een geweldig uitzicht.
The old citadel stands on top of the hill and offers a great view.
In this case, 'citadel' is metaphorically referring to a center or place strongly associated with a particular domain.
De stad was ooit een citadel van kennis en cultuur.
The city was once a citadel of knowledge and culture.
Here, the term 'citadel' refers to a physical structure used as a place of safe retreat, emphasizing its protective function.