regnant

Etymology

From French régnant and its source, the present participle of Latin regnāre.

adj

1. Reigning, ruling; currently holding power.
   The people are now the State, their will is the regnant will, and that will has this characteristic — it loves principles, it hates compromises; and the principles it loves must be regulative, fit to be applied to the work and guidance of life. 1910, A. M. Fairbairn, Studies in Religion and Theology, page 99
2. Dominant; holding sway; having particular power or influence.
   The doors of his temples were kept open in time of war, the time in which the ideas of contradiction and conflict are most naturally regnant. 2010, Christopher Hitchens, Hitch-22, Atlantic, published 2011, page 7
3. (postpositive) of a monarch, ruling in one's one right; often contrasted with consort and dowager
   Queen Elizabeth II reigns as queen regnant, unlike her mother Queen Elizabeth The Queen Mother.

noun

1. (obsolete) A sovereign or ruler.