re-enrolment
/ˌriːɪnˈrəʊlm(ə)nt/ /ˌriːɛnˈrəʊlm(ə)nt/(US re-enrollment)
noun
The action or process of enrolling again; an instance of this.
Origin
Early 19th century; earliest use found in Jane Porter (d. 1850), novelist. From re- + enrolment, after re-enrol.