Fortress
/fˈɔrtrəs/
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Definition
(noun) A fortified place; a large and permanent fortification, sometimes including a town; for example a fort, a castle; a stronghold; a place of defense or security.
Sentence Examples
With you here beside me I'm not afraid of anything. You're my fortress.
The fortress was secure from every kind of attack.
CEFR Practice Quiz
The ancient ____ stood atop the cliff, overlooking the sea and providing a secure vantage point.