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fortress

for·tress [ fáwrtrəss ] (plural for·tress·es)


noun 
Definition:
 
1. military installation: a fortified place with a long-term military presence, often including a town

2. something impossible to get into: something that is impenetrable or acts as protection

[14th century. < Old French forteresse "strong place" < Latin fortis "strong"]
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