noun
club for enthusiasts; society of devotees
Refers to a club or association formed by people who share a strong interest in a particular subject, hobby, or activity. Often used in names of hobbyist groups.
彼は地元の写真愛好会に入っている。
He belongs to a local photography club.
この愛好会は毎月第一土曜日に集まります。
This enthusiast group meets on the first Saturday of every month.
クラブ is a broader term for any club, including sports or social clubs, whereas 愛好会 specifically implies a group of enthusiasts or devotees.
Compound of 愛好 (aikō, 'love, devotion') and 会 (kai, 'meeting, society').