released prisoner; ex-convict
Formal legal term for a person who has been released after serving a full prison sentence. Used in official contexts.
Rehabilitation support for released prisoners is important.
He started a new life as an ex-convict.
Compound of 満期 (expiration of term) + 釈放 (release) + 者 (person). The exact historical derivation is uncertain, but the term is a straightforward legal compound.