Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
interschool is an adjective meaning "used of competition or cooperation between secondary schools". It carries one recorded sense.
used of competition or cooperation between secondary schools
Definitions, synonyms and semantic relations for interschool come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.