Etymology
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affiliation (n.)

1751, "adoption," from French affiliation, from Medieval Latin affiliationem (nominative affiliatio), noun of action from past-participle stem of Latin affiliare "to adopt as a son," from ad "to" (see ad-) + filius "son" (see filial). Figurative sense of "adoption by a society, of branches" first recorded 1799 (the verb affiliate in a related sense is from 1761). Meaning "friendship, relationship, association" is from 1852.

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Definitions of affiliation

affiliation (n.)
a social or business relationship;
a valuable financial affiliation
Synonyms: association / tie / tie-up
affiliation (n.)
the act of becoming formally connected or joined;
welcomed the affiliation of the research center with the university
From wordnet.princeton.edu