bastion — OET

bastion

noun

1 he had fortified the stronghold with ditches and bastions:

rampart, bulwark, parapet, fortification, buttress, outwork, projection, breastwork, redoubt, barbican, stockade, palisade;

rare bartizan.

2 the last bastion of male-only suffrage in Europe:

stronghold, bulwark, defender, support, supporter, guard, protection, protector, defence, prop, mainstay.

bastion Oxford Dictionary of English