founding member

founding member (plural founding members)

1. (US) A member of an organization that was involved in, or whose membership commenced with, the organization's foundation.

   Synonyms: charter member, (UK) founder member

   The United Nations had 77 founding members.

• founding father
• founding mother

• “founding member”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “founding member”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “founding member”, in Collins English Dictionary.