Definition of bastion
1
: a projecting part of a fortification
a bastion at each of the fort's five corners
2
: a fortified area or position
bombing island bastions
3
: stronghold sense 2
the last bastion of academic standards — Amer. Scientist
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Merriam-Webster unabridged
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Time Traveler for bastion
The first known use of bastion was in 1546
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