fastness

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fastness /ˈfæstnəs/ Brit /ˈfɑːstnəs/ noun
plural fastnesses
fastness
/ˈfæstnəs/ Brit /ˈfɑːstnəs/
noun
plural fastnesses
Learner's definition of FASTNESS
[count] literary
: a place that is difficult to get to or that can be easily defended if it is attacked