citadel
US /ˈsɪt̬.ə.del/
UK /ˈsɪt̬.ə.del/
1.
a fortress, typically on high ground, protecting or dominating a city
:
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The ancient citadel stood proudly overlooking the city.
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The invaders found it difficult to breach the strong citadel.
2.
a strong, secure place or position
:
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The university is a citadel of academic freedom.
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He built a financial citadel to protect his assets.