What is another word for "recurrence"?

Roget's Thesaurus (1911) lists these synonyms for "recurrence": again, and, back, backsliding, bad, capricious, desultory, deterioration, fall, falling, fitful, immethodical, irregular, irregularity, irregularly, lapse, off, rambling, recidivate, recidivation, recidivism, recrudescence, relapse, retrogradation, retrograde, retrogression, return, sink, slide, spasmodic, state, uncertain, uncertainty, variable.