1. sovereign; ruler; head of state
Wikipedia definition
2. Head of stateA head of state is the individual who serves as the chief public representative of a monarchy, republic, federation, commonwealth or other kind of state. His or her role generally includes legitimizing the state and exercising the political powers, functions, and duties granted to the head of state in the country's constitution and laws. In nation states the head of state is often thought of as the official "leader" of the nation.
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