REGNANT Meaning of REGNANT in English [reg.nant] adj [L regnant-, regnans, prp. of regnare to reign, fr. regnum] (1600) 1: exercising rule: reigning 2. a: having the chief power: dominant b: of common or widespread occurrence Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012