reformatory UK /ɹɪˈfɔː(ɹ)mətəɹi/US /ɹəˈfɔɹməˌtɔɹi/adjective 1noun 1forms 3 adjective1 •Of, pertaining to, or conducive to reform; reformative.Other reformatory schools might not strike that balance between reform and education. — 2019 noun1 •A prison, especially one for juveniles; a reform school.It was the nicest-looking property Elwood had ever seen—a real school, a good one, not the forbidding reformatory he’d conjured the last few weeks. — 2019 formsreformatories · more reformatory · most reformatory