The story
- Late Latin · derived fromadfīliō
- Medieval Latin · borrowed fromaffīliātus
- English todayaffiliate
From Medieval Latin affīliātus, the passive past participle of Late Latin adfīliō, affīliō (“to adopt as son”), from ad- + fīlius + -ō. Equivalent to Latin affīliō + -ate. Compare French affilié (noun).
Etymology from Wiktionary, CC BY-SA 4.0.