1. a ruler with unlimited power over all things; an absolute sovereign
Usage: rare; formal

Examples

• The ancient text described a mythical omniarch who controlled both earthly and celestial realms.
• In the fantasy novel, the omniarch’s decree affected every living creature in the kingdom.
• The philosopher argued that no mortal could truly serve as an omniarch over nature itself.
• Historical records suggest the emperor aspired to be an omniarch but faced constant rebellion.
• The concept of an omniarch appears in various religious and political treatises throughout history.