citadel
BrE /ˈsɪtəd(ə)l/ AmE /ˈsɪtədəl/
noun en → es
a large, strong fortress or castle that protects a city or town
fortaleza, castillo, recinto fortificado
- the citadel of somewhere
Collocations citadel of power · citadel of learning
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The citadel was built to protect the city from invaders.
La fortaleza fue construida para proteger la ciudad de los invasores.
a place or organization that is seen as a model of something good, such as freedom or learning
ideal, modelo, centro de excelencia
- the citadel of somewhere
Collocations citadel of knowledge · citadel of democracy
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The university is considered the citadel of learning in the country.
La universidad es considerada el centro de excelencia en la educación del país.