-nənt adjective
Etymology: Latin regnant-, regnans, present participle of regnare to reign — more at reign
1. : exercising rule or authority : reigning
a queen regnant
2.
a. : having the chief power : exercising sway : dominant
filled with a regnant determination to defend herself — Gilbert Parker
b. : of common or widespread occurrence : prevalent
the vices regnant — Jonathan Swift