Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Language: Medieval Latin
Origin: , past participle of affiliare 'to take over as a son', from Latin ad- 'to' + filius 'son'

affiliate

1 verb
     
af‧fil‧i‧ate1
1 [intransitive,transitive usually passive] if a group or organization affiliates to or with another larger one, it forms a close connection with it
affiliate with
The Society is not affiliated with any political party.
affiliate to
the church's right to affiliate to Rome
2

affiliate yourself to/with somebody/something

to join or become connected with a larger group or organization:
She affiliated herself with the Impressionist school of painting.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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