AFFIL'IATE, verb transitive [Latin ad and filius, a son.] 1. To adopt; to receive into a family as a son. 2. To receive into a society as a member, and initiate in its mysteries, plans, or intrigues - a sense in which the word was much used by the Jacobins in France, during the revolution.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI