chief of state
noun/ˌtʃiːf əv ˈsteɪt/
/ˌtʃiːf əv ˈsteɪt/
(plural chiefs of state)
(North American English)- the person who holds the formal title of head of a country, as distinguished from the leader of a government
- King Charles is the chief of state of the United Kingdom.
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chief of state