Entry 2 senses · 2 variants Webster, 1913 Reformatory /(-t?*r?)/ · Re·form·a·to·ry · IPA /ɹəˈfɔɹməˌtɔɹi/ a. n. 01 a. Tending to produce reformation; reformative. 1. Tending to produce reformation; reformative. 02 n. An institution for promoting the reformation of offenders. pl. -ries ((-r�z)) 1. An institution for promoting the reformation of offenders. “Magistrates may send juvenile offenders to reformatories instead of to prisons.” — Eng. Cyc.