This is the 9623rd most frequent Japanese word.
聴講
"聴講" means "attending a lecture or audit a course."
聴講 is used to describe attending a lecture without enrolling for credit.
大学で彼は物理学の授業を聴講しています。
At the university, he is auditing a physics class.
聴講 here refers to participating in a class, typically with the intent of gaining knowledge without formal commitment.
職業スキルを向上させるために、彼女はオンラインクラスを聴講しました。
To improve her professional skills, she auditorily attended an online class.
聴講 is employed to highlight gaining insights by attending lectures or courses informally.