noun
double sessions; two-part school day
Refers to a school schedule split into two sessions, often morning and afternoon, to accommodate more students.
戦後の生徒増加で、多くの学校が二部授業を実施した。
Due to the increase in students after the war, many schools implemented double sessions.
Compound of 二部 (にぶ, 'two parts') and 授業 (じゅぎょう, 'class, lesson').