the act of affiliating; state of being affiliated or associated.

1745–55; < Medieval Latin affīliātiōn- (stem of affīliātiō adoption); see affiliate, -ion

interaffiliation, noun
nonaffiliation, noun
preaffiliation, noun
reaffiliation, noun
superaffiliation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  (tr; 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
2.  (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
3.  a.  a person or organization that is affiliated with another
 b.  (as modifier): an affiliate member
[C18: from Medieval Latin affīliātus adopted as a son, from affīlīare, from Latin filius son]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1751, "adoption," from Fr. affiliation, from M.L. affiliationem (nom. affiliatio), from L. affiliatus, pp. of affiliare "to adopt a son," from L. ad- "to" + filius "son" (see filial). Fig. sense of "adoption by a society, of branches" first recorded 1799 (affiliate in this sense is from 1761).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Include your name, phone number and industry affiliation.
But his athletic affiliation matters less than his track record.
The series focuses on women who are popular and influential, regardless of
  political affiliation.
Just wondering if you had some kind of affiliation with these guys.
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