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).

The figurative sense of "adoption by a society," in reference to a local chapter or branch, is recorded by 1799 (the verb affiliate in a related sense is from 1761). The meaning "friendship, relationship, association" is by 1852.

updated on September 15, 2022

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