noun
partner school; cooperating institution
Used in educational contexts for schools that collaborate, e.g., in distance learning, exchange programs, or joint research.
この大学は海外の協力校と交換留学プログラムを実施している。
This university runs an exchange program with partner schools abroad.
遠隔授業のために、複数の協力校がネットワークを組んでいる。
Several cooperating schools have formed a network for distance learning.
Compound of 協力 (cooperation) and 校 (school). The term is straightforward and modern, with no obscure historical derivation.