(n.) The state or quality of being durable; the power of uninterrupted or long continuance in any condition; the power of resisting agents or influences which tend to cause changes, decay, or dissolution; lastingness.

abidingness body ceaselessness changelessness coeternity cohesiveness concreteness constancy continualness continuance density durableness duration endlessness endurance eternalness eternity ever-duringness everlastingness everness firmness fixedness foreverness frozenness hardening hardiness hardness immobility immovability immovableness immutability incessancy indestructibility infinite duration infinity infrangibility interminability invariability invariableness inveteracy lastingness leatherlikeness long standing mass materiality never-endingness palpability perdurability perenniality perennialness permanence permanency perpetualness perpetuity persistence persistency ponderability quiescence resistance rigidity ropiness sempiternity solidity soundness stability stamina standing stasis steadfastness steadiness stiffness stoutness strength stringiness stubbornness sturdiness substance substantiality substantialness tangibility tenacity timelessness torpor toughness unbreakability unbreakableness unceasingness unchangeability unchangingness viscidity vitality