Meaning of the word fastnesses in English

What does fastnesses mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

fastnesses

US /ˈfæst.nəsɪz/

UK /ˈfɑːst.nəsɪz/

places that are difficult to reach or attack, often used for defense or refuge

Example:

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The rebels retreated to their mountain fastnesses, making it hard for the army to pursue them.

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Ancient civilizations often built their cities in natural fastnesses for protection.