parent-teacher association
noun [ C ] uk/ˌpeə.rəntˈtiː.tʃər ə.səʊ.siˌeɪ.ʃən/ us/ˌper.əntˈtiː.tʃɚ ə.soʊ.siˌeɪ.ʃən/ (abbreviation PTA); (US also parent-teacher organization)
（尤指通过组织募款活动来对学校进行帮助的）家长教师联谊会，家长教师会
an organization run by teachers and the parents of children at a school that tries to help the school, especially by organizing activities that raise money for it