Dominion

A Dominion is a realm or other such territory under which a sovereign rules.

Old World meaning
In the Old World, the term Dominion is understood to mean a Realm under the sovereignty of a Crown.

New World meaning
In the New World, the term Dominion is understood to mean a Realm under the sovereignty of the People thereof. For example, the names "Dominion of Australia", "Dominion of Québec", and "Dominion of Virginia" all have the same political meaning; that is to say each of them are a Realm in which the People thereof hold the sovereign Power in, over, and for that Realm; and it is this Power which rules and governs the same.