bastion

noun

1. a group that defends a principle

   noun.group

   Examples

   A bastion against corruption.

   The last bastion of communism.

   Source: WordNet 3.0

2. a stronghold into which people could go for shelter during a battle

   noun.artifact

   Synonyms citadel

   Source: WordNet 3.0

3. projecting part of a rampart or other fortification

   noun.artifact

   Source: WordNet 3.0

4. A work projecting outward from the main inclosure of a fortification, consisting of two faces and two flanks, and so constructed that it is able to defend by a flanking fire the adjacent curtain, or wall which extends from one bastion to another. Two adjacent <i>bastions</i> are connected by the <i>curtain</i>, which joins the flank of one with the adjacent flank of the other. The distance between the flanks of a bastion is called the <i>gorge</i>. A <i>lunette</i> is a detached bastion. See <u>Ravelin</u>.

   noun

   Source: webster1913