1540s, "steady or firm adherence to or continuance in a state, course of action, or pursuit that has been entered upon, especially if more or less obstinate," from Middle French persistance, from persistant "lasting, enduring, permanent," from Latin persistentem (nominative persistens), present participle of persistere (see persist). In 16c. often spelled persistance, but the classical spelling prevailed. Meaning "continuance of an effect after the cause which gave rise to it is removed" is from 1862. Related: Persistency.