What is Dominion?

Legal Definition
The right of the owner of a thing to use it or dispose of it at his pleasure. See Domain; 1 White's New Coll. 85; Jacob's Intr. 39.
-- Bouviers Law Dictionary
Legal Definition
Ownership or right to property. 2 Bl. Comm. 1. Title to an article of property which arises from the power of disposition and the right of claiming it Baker v. Westcott, 73 Tex. 129, 11 S. W. 157. "The holder has the dominion of the bill." 8 East, 579. Sovereignty or lordship; as the dominion of the seas. Moll, de Jure Mar. 91, 92. In the civil law, with reference to the title to property which is transferred by a sale of it, dominion is said to be either "proximate" or "remote," the former being the hind of title vesting in the purchaser when he has acquired both the ownership and the possession of the article, the latter describing the nature of his title when he has legitimately acquired the ownership of the property but there has been no delivery. Coles v. Perry, 7 Tex. 109.
-- Black's Law Dictionary