Occurring or taking place between two or more schools.(adjective)
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Use "interschool" in a sentence
"The Green Cup Challenge® is anational student-driven interschool energy Challenge that asks schools to measure, reduce and report back their energy reductions over a one-month period."
"What is important to us is the average course evaluation for a large number of classes and instructors, and the aggregation of data should largely eliminate major interschool biases in the data."
"After the first interschool soccer game, I proudly tell my mum that I stopped the other team from scoring eight goals."