bastion

Noun
  1. A group that defends a principle (synset 108081208)
    "a bastion against corruption"; "the last bastion of communism"
    is a type of: defence, defence force, defense, defense force - an organization of defenders that provides resistance against attack
  2. A stronghold into which people could go for shelter during a battle (synset 102809273)
    is a type of: fastness, stronghold - a strongly fortified defensive structure
    subtypes:
    • acropolis - the citadel in ancient Greek towns
    • kremlin - citadel of a Russian town
    specific instances: kremlin - citadel of Moscow, housing the offices of the Russian government
    same as: citadel
  3. Projecting part of a rampart or other fortification (synset 102809168)
    is a type of: fortification, munition - defensive structure consisting of walls or mounds built around a stronghold to strengthen it

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