imprisonment
(3) Definitions In this subsection— (A) the term “covered period” means the period beginning on the date on which an individual is convicted of a violation of section 2423 of title 18 and ending on the later of— (i) the date on which the individual is released from a sentence of imprisonment relating to the offense; and (ii) the end of a period of parole or other supervised release of the covered individual relating to the offense; and (B) the term “imprisonment” means being confined in or otherwise restricted to a jail, prison, half-way house, treatment facility, or another institution, on a full or part-time basis, pursuant to the sentence imposed as the result of a criminal conviction.