dominium noun3 •The ownership of a thing. •Political unitHowever, this does not mean that these are the only types of kingdoms, nor that only kingdoms are dominiums. — 2009 •The highest category in the classification of organisms, ranking above regnum.The MC was composed of agents from different separated Dominium like Bacteria (Lactobacillum) and Eukaria (yeast). — 2012 formsdominiums