This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
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n. Return or reversion to a certain state.

n. The instance of recurring; frequent occurrence.

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

n. Recourse.

n. The act of recurring, or state of being recurrent; return; resort; recourse.

n. The act of recurring, or the state of being recurrent; return.

n. Resort; the having recourse.

n. happening again (especially at regular intervals)

""I fancy he's had what he calls a recurrence," says the doctor."

recurrency   

repeat    repetition   

reversion   

recurrent    recursive    recursivity    recursion   

reversion    flashback    atavism    throwback   

return    resort    recourse    reoccurrence   

coinsurance    concurrence    deterrence    occurrence    transference   

repetition    incidence    occurrence    progression    relapse    cessation    renewal    onset    outbreak    diagnosis