perseverance (n.)

mid-14c., perseveraunce "will or ability to persevere, tenacity," from Old French perseverance "persistence, endurance" (12c., Modern French persévérance) and directly from Latin perseverantia "steadfastness, constancy," from perseverant- past-participle stem of perseverare "continue steadfastly" (see persevere). From late 14c. as "quality or state of continuing or enduring."