Definition of fortress in English:


Syllabification: for·tress
Pronunciation: /ˈfôrtrəs


  • 1A military stronghold, especially a strongly fortified town fit for a large garrison.
    More example sentences
    • World War I saw the evolution of a new fortification setup combining field strongholds with fortresses.
    • City walls, towers, churches, and fortresses strongly connect Estonians to the past.
    • Most contemporary commanders used their troops in a slow, expensive, attritional warfare based on sieges of selected fortified cities or fortresses.
    fort, castle, citadel, blockhouse, stronghold, redoubt, fortification, bastion; fastness
  • 1.1A heavily protected and impenetrable building.
    More example sentences
    • Modern day builders are building modern day fortresses to protect us from our fellow countrymen.
    • Many students and parents feel that private institutions are protected fortresses for the rich.
    • He never intended for voice mail to become the impenetrable fortress of evil that it has become today.
  • 1.2 figurative A person or thing not susceptible to outside influence or disturbance: he had proved himself to be a fortress of moral rectitude
    More example sentences
    • No nation can erect a fortress against influenza - not even the world's wealthiest country.
    • A paranoid fortress mentality has unfortunately gripped the government policy makers in the most underpopulated country on earth.
    • But already we pay a price, levied not in blood but in freedom, as a fortress mentality seeps into the national culture.


Middle English: from Old French forteresse 'strong place', based on Latin fortis 'strong'.

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