1. (a.) Having power; ruling; reigning\; as, a queen regnant.

2. (a.) Having the chief power; ruling; predominant; prevalent.

ascendant at the head average besetting boss chief commanding common controlling current dominant epidemic general governing head hegemonic hegemonistic in ascendancy in charge in chief in the ascendant leading master normal on the throne ordinary overbearing pandemic paramount popular predominant predominate predominating prepollent preponderant preponderate prepotent prevailing prevalent rampant regulating regulative regulatory reigning rife routine ruling running sovereign standard stereotyped supreme swaying usual widespread