prin·​ci·​pate | \ ˈprin(t)səˌpāt, -səpə̇t\
plural -s

Definition of principate

1 : princely power : supreme rule

2 obsolete

b : a principal person : prince
4 : the power or term of a Roman princeps

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History and Etymology for principate

Middle English principat, from Latin principatus, from princip-, princeps first person, prince + -atus -ate

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