bastion bastion /ˈbæstʃən/

noun

1. () A group that defends a principle  ( bastion )
   a group that defends a principle
    A bastion against corruption
   a bastion against corruption
    The last bastion of communism
   the last bastion of communism
   
2. Projecting part of a rampart or other fortification  ( bastion )
   projecting part of a rampart or other fortification
    The castle's bastion was well-fortified to protect against enemy assaults.
   The castle's bastion was well-fortified to protect against enemy assaults.
   
   
3. A stronghold into which people could go for shelter during a battle  ( bastion , citadel )
   a stronghold into which people could go for shelter during a battle