When used in reference to the estate tax in this chapter:
"Commission," "State Tax Commission" or "department" means the Department of Revenue of the State of Mississippi.
"Commissioner," "Chairman of the State Tax Commission" or "chairman of the commission" means the Commissioner of Revenue of the Department of Revenue, or any agent appointed by law under him.
"Executor" means the executor or administrator of the decedent, or, if there is no executor or administrator, any person who takes possession of any property of the decedent.
"Person" means persons, corporations, associations, joint stock companies and business trusts.
"Transfer" shall be taken to include the passing of property or any interest therein, in possession or enjoyment, present or future, by inheritance, descent, devise, succession, bequest, grant, deed, bargain, sale, gift, or appointment in the manner herein described.
"Decedent" shall include the testator, intestate, grantor, bargainor, vendor or donor.
"Resident" means natural persons and includes for the purpose of determining liability for the tax imposed, any person domiciled in the State of Mississippi and any other person who maintains a permanent place of abode within the state and spends in the aggregate, more than six (6) months of the taxable year within the state.
"Nonresident" shall apply to any natural person whose domicile is without the State of Mississippi or who maintains a place of abode without the state, and spends in the aggregate, more than six (6) months of the taxable year without the state.