|Origin:||, past participle of affiliare 'to take over as a son', from Latin ad- 'to' + filius 'son'|
1 [intransitive,transitive usually passive]
if a group or organization affiliates to or with another larger one, it forms a close connection with it
The Society is not affiliated with any political party.
the church's right to affiliate to Rome
to join or become connected with a larger group or organization:
She affiliated herself with the Impressionist school of painting.