IPA: /ˌdɪsəˈfɪliˌeɪʃən/
KK: /dɪsəˈfɪliˌeɪʃən/
The act of ending a connection or relationship with a group or organization.
His disaffiliation from the club surprised everyone.
Disaffiliation → It is formed from "dis-" (meaning apart) and "affiliation" (from Latin "affiliare", meaning to adopt as a son or associate). The word "disaffiliation" means the act of separating or withdrawing from an association or group.
Think of being 'apart' ('dis-') from a group or association ('affiliation') — that's what disaffiliation means.