fortress


Concise Oxford English Dictionary © 2008 Oxford University Press:
fortress/ˈfɔːtrəs/
noun
  • 1 a military stronghold, especially a strongly fortified town.
  • 2 a person or thing not susceptible to outside influence.
– origin ME: from OFr. forteresse ‘strong place’, based on L. fortis ‘strong’.
'fortress' also found in these Oxford entries:

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