Definition of fastness noun from the Oxford Advanced American Dictionary

     

    fastness

     noun
    noun
    NAmE//ˈfæstnəs//
     
    (literary)
     
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  1. 1a place that is thought to be safe because it is difficult to get to or easy to defend synonym stronghold
  2. 2 a mountain fastness
See the Oxford Advanced Learner's Dictionary entry: fastness