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bastion (n.)

"projection from a rampart," 1560s, from French bastillon, diminutive of Old French bastille "fortress, tower, fortified building," from Old Provençal bastir "to build," perhaps originally "make with bast" (see baste (v.1)).

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Definitions of bastion from WordNet

bastion (n.)
a group that defends a principle;
the last bastion of communism
a bastion against corruption
bastion (n.)
a stronghold into which people could go for shelter during a battle;
Synonyms: citadel
bastion (n.)
projecting part of a rampart or other fortification;
From wordnet.princeton.edu