recurrence

noun

Etymology: From recurrent + -ence, cognate with Latin recurrentia, from recurrēns (“returning back, recurring”), form of recurrō (“to return, to recur”) (English recur).

1. Return or reversion to a certain state.
2. The instance of recurring; frequent occurrence.

   “I shall insensibly go on from a rare to a frequent recurrence to the dangerous preparations.”

3. A return of symptoms as part of the natural progress of a disease.

   “Near-synonym: relapse”

4. Recourse.