Fortress - Definition, Meaning & Synonyms

A fortress is a large building or complex of buildings used as a military stronghold. In a military sense, a fortress is often called a “fort."
From its original sense of stronghold, the word fortress has stretched to include strongholds in a more figurative sense. Martin Luther used fortress to describe unfailing spiritual support when he wrote, “A mighty fortress is our God.” When someone has a hard time trusting others, you might say they have retreated to a fortress of their own making.

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