do·min·ion 
(də-mĭnyən)
(də-mĭnyən)n.
1. Control or the exercise of control; sovereignty: "The devil ... has their souls in his possession, and under his dominion" (Jonathan Edwards).
2. A territory or sphere of influence or control; a realm.
3. often Dominion A self-governing nation under the nominal rule of the British monarch.
4. dominions Christianity See domination.
[Middle English dominioun, from Old French dominion, from Medieval Latin dominiō, dominiōn-, from Latin dominium, property, from dominus, lord; see dem- in the Appendix of Indo-European roots.]