Definitions:

1. Historically, the term was used in ancient Rome to describe the authority held by certain high-ranking officials, such as consuls or emperors, giving them the power to govern, enforce laws, and command armies. NOUN
   • In ancient Rome, consuls and emperors wielded imperium, granting them authority over both military and civil affairs.
2. Refers to the authority or power to command, often associated with supreme or absolute power, particularly in a political or military context. NOUN
   • Historically, the concept of imperium has been central to discussion about the nature of power and governance.
3. Supreme authority or absolute dominion. NOUN
   • The emperors of the imperium held absolute power and were considered divine beings.

Synonyms:

• dominance
• domination
• Dominion
• sovereignty
• supremacy