permanence

noun

Etymology: From Middle English permanence, permanens, from Middle French permanence, from Medieval Latin permanentia, from Latin permaneō (“to remain; last”).

1. The state of being permanent.

   “To foreigners we often seem guileless and overchatty, an impression which is dispersed when they find that much of our friendliness is just the ebullition of the moment and does not carry with it any permanence of devotion.”

   “Transport Scotland acknowledges that the permanence of the new fares regime could be the clincher in persuading people to "travel more often and make long-term choices with certainty, helping people to leave the car at home".”

2. The reciprocal of magnetic inductance.