af ‧ fil ‧ i ‧ a ‧ tion /əˌfɪliˈeɪʃ ə n/ BrE AmE noun
1 . [uncountable and countable] the connection or involvement that someone or something has with a political, religious etc organization
sb’s (political/religious etc) affiliation
the newspaper’s political affiliations
2 . [uncountable] when a smaller group or organization joins a larger one