noun
partner institution; affiliated school
Typically used in the context of foreign exchange or academic partnerships between universities or schools.
この大学は海外に多くの協定校を持っている。
This university has many partner institutions overseas.
協定校からの留学生を受け入れる。
We accept exchange students from our partner institutions.
Compound of 協定 (agreement, pact) and 校 (school). The term refers to a school with which a formal partnership agreement exists.