charter member
noun [ C ] mainly US uk/ˈtʃɑː.tə ˌmem.bər/ us/ˈtʃɑːr.t̬ɚ ˌmem.bɚ/
（社团或公司的）创始成员
a member of an organization who helped start the organization or became a member when it began
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。