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being in close formal or informal association; related:
a letter sent to all affiliated clubs; a radio network and its affiliated local stations.
to bring into close association or connection:
The research center is affiliated with the university.
to attach or unite on terms of fellowship; associate (usually followed by with in U.S. usage, by to in Brit. usage):
to affiliate with the church.
to trace the descent, derivation, or origin of:
to affiliate a language.
to adopt.
Law. to fix the paternity of, as an illegitimate child:
The mother affiliated her child upon John Doe.
to associate oneself; be intimately united in action or interest.
a branch organization.
Commerce.

a business concern owned or controlled in whole or in part by another concern.
a subsidiary.

a person who is affiliated; associate; auxiliary.
Contemporary Examples

Police say that Lil JoJo was affiliated with the rival Gangster Disciples.
Chicago Rapper Lil JoJo Went to His Grave for Taunting a Rival Gang Member Michael Daly October 6, 2012

In Pakistan, the al Qaeda–affiliated Taliban says it is sending fighters to join the battle in Syria and support al Qaeda.
Al Qaeda Is Back Bruce Riedel July 25, 2013

The Gingrich affiliated “527” group known as American Solutions for Winning the Future was founded in 2006.
Casino Magnate Sheldon Adelson Is Betting on Newt Gingrich Aram Roston December 16, 2011

And by a tipster who seems to be posing as a Tea Partier—but who one source suspects is affiliated with the Clintons?
The Strange Leak of the New Exposé ‘Clinton, Inc.’ Lloyd Grove July 13, 2014

After all, West may be considered controversial but he has also long been affiliated with high fashion.
Will Kim and Kanye Kill Vogue? Keli Goff March 23, 2014

Historical Examples

The Pharaoh of Joseph’s time seems to have affiliated with the Israelites as natural friends,–to assist him in case of war.
Beacon Lights of History, Volume II John Lord

“The same, in fact, I am affiliated to,” remarked the student.
Under Western Eyes Joseph Conrad

By this Act certain institutions, from which students might be examined, were affiliated with the University.
Ryerson Memorial Volume J. George Hodgins

“He may be affiliated to the police,” was the thought that passed through his mind.
Under Western Eyes Joseph Conrad

I affiliated myself to a section who, armed with long wooden swords, were enjoying some Turk’s-heading.
From Sea to Sea Rudyard Kipling

verb (əˈfɪlɪˌeɪt)
(transitive; foll by to or with) to receive into close connection or association (with a larger body, group, organization, etc); adopt as a member, branch, etc
(foll by with) to associate (oneself) or be associated, esp as a subordinate or subsidiary; bring or come into close connection: he affiliated himself with the Union
noun (əˈfɪlɪɪt; -ˌeɪt)

a person or organization that is affiliated with another
(as modifier): an affiliate member

v.

1761, from Latin affiliatus, past participle of affiliare “to adopt” (see affiliation). Outside legal use, always figurative. Related: Affiliated; affiliating.
adj.

1858, from affiliate (v.).
n.

1846, from affiliate (v.).