citadel
noun
cit·a·del
ˈsi-tə-dᵊl
-ˌdel
1
: a fortress that commands (see command entry 1 sense 2c) a city
2
: stronghold
the nation's citadel of health research—Constance Holden
a citadel of higher education
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Merriam-Webster unabridged
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