noun
part-time senior high school; evening high school
A high school offering classes in the evening or on a flexible schedule, often for working students. Contrasts with 全日制高校 (full-time day school) and 通信制高校 (correspondence school).
彼は昼間働きながら定時制高校に通っている。
He works during the day while attending a part-time high school.
定時制高校は夜間に授業を行うことが多い。
Part-time high schools often hold classes in the evening.