Origin and history of persevere

"through, by means of," 1580s (earlier in various Latin and French phrases, in the latter often par), from Latin per "through, during, by means of, on account of, as in," from PIE root *per- (1) "forward," hence "through, in front of, before, first, chief, toward, near, around, against."

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."