Bastion
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Metaphorical Use
When used metaphorically, 'bastion' implies strength, but also resistance to change. He was considered a bastion of the old ways in his rapidly modernizing neighborhood.
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Cultural Connotation
In many cultures, 'bastion' is associated with historical institutions or ideals thought to be inflexible. This university is a bastion of classical education.
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Positive or Negative
Depending on the context, 'bastion' can have a positive spin (safety, security) or negative (rigidity). The last bastion of resistance finally surrendered.