continuing education courses offered via radio or television; open university
父は定年後に放送大学で学び始めた。
After retirement, my father started studying at an open university.
退職者向けの講座が放送大学で開設された。
A course aimed at retirees was launched on the open-university station.
毎朝のラジオ番組で聞いた放送大学の講義が役立った。
The open-university lectures I listened to on the morning radio were quite useful.