n. Lordship; sovereign or supreme authority; the power of governing and controlling; empire: as, a territory under the dominion of a foreign power.n. The right of uncontrolled possession, use, and disposal; power of control.n. A territory and people subject to a specific government or control; a domain: as, the dominions of Prussia.n. plural Same as dominations. See domination, 3.n. Synonyms Sovereignty, sway, control, rule, mastery, ascendancy.