Part of speech: noun

A large permanent fort; a stronghold; castle.

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Usage examples "fortress":

  1. By the by, if we are going to the fortress, we must be off. - "Kitty's Class Day And Other Stories", Louisa M. Alcott.
  2. N. B.- We were within sight of the sea and the fortress of Acre. - "Byeways in Palestine", 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)", Max Aitken Beaverbrook.