affiliate
Concise Oxford English Dictionary © 2008 Oxford University Press:
affiliate
▶verb /əˈfɪlɪeɪt/ (usu. be affiliated to/with) officially attach or connect to an organization.
■ (of an organization) admit as a member.
▶noun /əˈfɪlɪət/ an affiliated person or organization.– derivatives
affiliation noun,
affiliative adjective.
affiliation noun,
affiliative adjective.
– origin C18 (earlier (C17) as affiliation): from med. L. affiliat-, affiliare ‘adopt as a son’.
'affiliate' also found in these Oxford entries:

