Definify.com

Webster 1828 Edition

ppr.

ra'ning.

Holding or exercising supreme power; ruling; governing as king, queen or emperor.

a. Predominating; prevailing; as a reigning vice or disease.

reigning ‎(not comparable)

Currently ruling or holding a position.
The reigning world heavyweight champion said he'd defend his title once more and then retire even if he won.

reigning