あつ集atsuまりmari
1.
The act of people coming together for a specific purpose or event, often in a designated place.
2.
A group formed by the accumulation of individuals or objects, often having a shared characteristic or interest.
3.
An organized gathering of individuals for discussion, decision-making, or social interaction.
4.
The phenomenon of objects or individuals clustering together, which can be characterized by their proximity or mutual relation.
Example:
ごく内輪の集まりなのです。