noun
club activities; group activities
Refers to the organized activities of a student club or circle, typically in a university setting. Often implies a less formal or more interest-based group than a strict school club (部活).
大学ではサークル活動に参加する学生が多い。
Many students participate in club activities at university.
サークル活動を通じて友達ができた。
I made friends through club activities.