Wiktionary
interschool
a. Occurring or taking place between two or more schools.
WordNet
interschool
adj. used of competition or cooperation between secondary schools [syn: interscholastic]
Usage examples of "interschool".
Because Walter Matern had won the shot-put and the three-thousand-meter run at the interschool track meet the preceding year, so earning the reputation of a promising athlete, he was able to gain admission for Eddi Amsel and make him into a Young Prussian.
I met her at an interschool dance at the community college last September.
Rob cleared out a few dead-ends-insomniacs checking interschool mail, and a couple of the standard programs that ran all the time to keep applications running.