people who share an interest; kindred spirits
A somewhat literary or formal expression for people who share the same hobby, passion, or intellectual pursuit. Often used in contexts like clubs, societies, or gatherings of enthusiasts.
This club was formed by people who share the same interest.
It's enjoyable to talk with kindred spirits.
A compound of 同好 (same interest) + の (possessive particle) + 士 (person, gentleman). The exact historical origin is uncertain, but it follows a classical pattern for describing groups of people with a shared trait.