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Noun: enduringness  in'd(y)ûr-ing-nus [N. Amer], in'dyûr-ing-nus or en'dyûr-ing-nus [Brit]
  1. Permanence by virtue of the power to resist stress or force
    "The enduringness of the leather shoes made them a worthwhile investment";
    - lastingness, durability, strength

Type of: permanence, permanency