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Definition of fortress
fortress
/ˈfɔːr.trəs/
for · tress
Plural:fortresses
fortress Lexical Profile
CEFR
B2
Grade
6
Tier
2
Usage
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Wordle Guess
• noun
1
A heavily protected and impenetrable military stronghold, typically consisting of high walls, towers, and defensive structures designed to house and protect a garrison.
Example
"The ancient stone fortress situated on the coastal cliffs served as the primary line of defense for the historic port city."
2
A place or source of exceptional security, refuge, or defense against outside influences.
Example
"The university library became her intellectual fortress, a quiet sanctuary where she could focus entirely on her academic research."
Synonyms
View all synonyms for fortress• Rhymes for fortress
Word Origin & Etymology
From Middle English 'forteresse', borrowed from Old French 'forteresse', deriving from Late Latin 'fortaritia' and Latin 'fortis' meaning 'strong'.
Cite this Entry
Wordmom. (2026). Definition of Fortress. In Wordmom Dictionary. Retrieved Oct 15, 2026, from https://wordmom.com/dictionary/fortress