1751, "adoption," from French affiliation, from Medieval Latin affiliationem (nominative affiliatio), noun of action from past participle stem of Latin affiliare "to adopt 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 this sense is from 1761).
1. The group has no affiliation to any political party.
2. The officer cited the federation's rule on affiliation.
3. He was arrested because of his political affiliation.
4. There is no affiliation between our organization and theirs , even though our names are similar.
5. The kidnappers had no affiliation with any militant group.