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The Collaborative International Dictionary
Recidivation

Recidivation \Re*cid`i*va"tion\ (r[-e]*s[i^]d"[i^]*v[=a]"sh[u^]n), n. [LL. recidivatio.] A falling back; a backsliding.
--Hammond.

Wiktionary
recidivation

n. relapse of a disease or a symptom.