association
/əˌsoʊʃiˈeɪʃən/
a formal organization of people or groups of people
中文释义：协会；社团；联盟
The medical association issued new guidelines for patient care.
医学协会发布了新的患者护理指南。
He joined the local historical association to preserve old buildings.
他加入了当地历史协会以保护古建筑。