IPA: /ˌʌnəˈfɪlieɪtɪd/
KK: /ʌnəˈfɪlɪeɪtɪd/
Not connected or associated with any group or organization; independent.
She is an unaffiliated voter, meaning she does not belong to any political party.
Unaffiliated → It is formed from "un-" (meaning not) and "affiliated" (from Latin "affiliatus", meaning to adopt or to associate). The word "unaffiliated" means not associated or not connected with a group or organization.
Think of 'not' ('un-') being connected or associated ('affiliated') with something — that's why unaffiliated means not being part of a group.