More definitions on https://www.dictionary.com/browse/dominion
noun
1) the power or right of governing and controlling; sovereign authority.
2) rule; control; domination.
3) a territory, usually of considerable size, in which a single rulership holds sway.
4) lands or domains subject to sovereignty or control.
5) Government. a territory constituting a self-governing commonwealth and being one of a number of such territories united in a community of nations, or empire: formerly applied to self-governing divisions of the British Empire, as Canada and New Zealand.
dominions, Theology. domination (def. 3).