i Register
In some senses, interrex is marked as figuratively. Watch for register when choosing this word.
interrex
noun 3
Definitions
noun
1
An official in Ancient Rome who acted as single head of state during the interregnum between two consulates.
2
An equivalent regent from the death of a Polish king till the election and enthronement of his successor.
3
A similar interim ruler, CEO, etc.
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