noun
part-time school system; evening school system
Refers to a school system (usually high school) where classes are held in the evening or at other fixed times for students who work during the day. Often contrasted with 全日制 (full-time) and 通信制 (correspondence).
彼は昼間働いて、夜は定時制高校に通っている。
He works during the day and attends a part-time high school at night.
定時制
In the part-time course, you can study at your own pace.
通信制 is a correspondence school system, whereas 定時制 involves scheduled in-person classes.
Compound of 定時 (fixed time) and 制 (system). The term was established in post-war Japanese education reform to describe part-time schooling options.