permanence
n.the quality of lasting for a very long time or forever. You use this to describe things that do not change or disappear easily.
n.the state or quality of being permanent; enduring for an indefinitely long period. Often used in technical contexts to describe the stability of a physical or chemical state.
“The scientist studied the permanence of the new paint.”
“In a world of constant digital updates, many people seek a sense of permanence through physical objects and handwritten letters.”
“The architect's design focused on the permanence of the structure, using materials that would withstand centuries of environmental wear and tear without significant degradation.”
“It was the economy that ensured the permanence of the currency.”
From Middle English permanence, permanens, from Middle French permanence, from Medieval Latin permanentia, from Latin permaneō (“I remain; last”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.