noun which may take the genitive case particle 'no', noun
outside school; off-campus
Refers to areas, activities, or events that are outside the school grounds or not part of the school curriculum.
校外学習で博物館に行った。
We went to the museum for an off-campus study trip.
校外での活動も大切だ。
Activities outside school are also important.
校内 means inside the school grounds, while 校外 means outside them.
out-of-school learning; off-campus learning
Compound of 校 (school) and 外 (outside).