Activities conducted outside of class time at schools or educational institutions—club activities, volunteer work, and other extracurricular pursuits.
中学生の多くは放課後に部活動という課外活動に参加する。
Many junior high students participate in club activities, a form of extracurricular activity, after school.
大学では課外活動を通じてリーダーシップを学ぶ学生も多い。
At university, many students learn leadership through extracurricular activities.
学校は課外活動の安全管理を徹底する必要がある。
Schools need to thoroughly manage the safety of extracurricular activities.