Coterie suggests a group that's exclusive or private, with members sharing strong common interests. The secret coterie of magicians shared ancient tricks only with trusted members.
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Informal Setting
Although it sounds formal, coterie is often used to describe informal social groups. Their coterie would casually meet at the café to exchange novels and discuss literature.
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Positive Vibe
The word coterie often has a positive connotation, implying a sense of camaraderie among the members. The coterie of amateur astronomers enjoyed stargazing and sharing their discoveries.