charter member

charter member (plural charter members)

1. (Canada, US) An original member of an organization; a member named in an organization's charter.

   Synonyms: founding member, founder member

• “charter member”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “charter member”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “charter member”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
• “charter member”, in Collins English Dictionary.