dis ‧ af ‧ fil ‧ i ‧ ate /ˌdɪsəˈfɪlieɪt/ BrE AmE verb [intransitive, transitive + from] formal
if an organization disaffiliates from another organization or is disaffiliated from it, it breaks the official connection it has with it OPP affiliate
—disaffiliation /ˌdɪsəfɪliˈeɪʃ ə n/ noun [uncountable]