charity school; private academy
Historically, a school established for public good or charitable purposes. In modern Japanese, it is almost exclusively encountered in the names of specific private schools (e.g., 慶應義塾). The standalone noun is rare.
Keio Gijuku is one of the most famous private academies in Japan.
「義塾」という言葉は、今では主に学校名の一部として使われています。
The word 義塾 is now mainly used as part of school names.