/ əˌfɪliˈeɪʃn; NAmE / noun [ U , C ] ( formal )
1.
a person's connection with a political party, religion, etc. :
He was arrested because of his political affiliation.
2.
one group or organization's official connection with another
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WORD ORIGIN
late 18th cent.: from French , from medieval Latin affiliatio(n-) , from the verb affiliare , from ad- towards + filius son.