recurrence (n.)

"returning from time to time, reappearing, repeated," 1660s, from French recurrent (16c.) and directly from Latin recurrentem (nominative recurrens), present participle of recurrere "run back, hasten back, return" (see recur). From 1590s as a noun ("recurrent artery or nerve," one turned back on itself).

also re-occurrence, "a further occurrence," 1804; see re- "again" + occurrence. Also compare recurrence.