IPA: /ˈæb.dɪ.keɪ.tər/
KK: /æbˈdɪkeɪtər/
A person who gives up their position of power or responsibility, especially a king or leader.
The king was an abdicator, choosing to relinquish his throne in favor of his son.
Abdicator → It is formed from "ab-" (meaning away) and "dicare" (meaning to proclaim or declare). The word describes someone who proclaims or declares their departure from a position of authority or responsibility.
Think of someone 'proclaiming' ('dicare') that they are stepping 'away' ('ab-') from their role — that's why abdicator means someone who renounces their position.