Rēg'nant, a.

a. [Lat. regnans, p. pr. of regnare, to reign; Fr. régnant, Sp. regnante, reinante, It. regnante.]

1. Exercising regal authority; reigning; as, a queen regnant.
2. Having the chief power; ruling; predominant; prevalent. “A traitor to the vices regnant.” Swift.