What does the word fortress mean?

Usage examples for fortress

  1. By the by, if we are going to the fortress, we must be off. – Kitty's Class Day And Other Stories by Louisa M. Alcott
  2. N. B.- We were within sight of the sea and the fortress of Acre. – Byeways in Palestine by James Finn
  3. Far better the enemies and the mistakes of youth than this final assault on the fortress of inner calm and happiness within the mind. – Success (Second Edition) by Max Aitken Beaverbrook
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