Fortress Definition

fôrtrĭs
fortresses
noun
fortresses
A fortified place; fort.
A mighty fortress is our God.
Webster's New World
The definition of a fortress is a secured and strong place.
An example of a fortress is a wall made out of stone that protects a city.
YourDictionary

(chess) A position that, if obtained by the weaker side, will prevent penetration by the opposing side, generally achieving a draw.

Wiktionary
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verb
fortresses
To protect by or furnish with a fortress.
Webster's New World
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Other Word Forms of Fortress

Noun

Singular:
fortress
Plural:
fortresses

Origin of Fortress

  • Middle English forteress from Old French from Medieval Latin fortalitia from Latin fortis strong bhergh-2 in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Old French forteresce, from Medieval Latin

    From Wiktionary

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