(1) “Death tax” means any tax levied by a state on account of the transfer of or shifting of economic benefits in property at death or in contemplation thereof or intended to take effect in possession or enjoyment at or after death, whether denominated an “inheritance tax,” “transfer tax,” “succession tax,” “estate tax,” “death duty,” “death dues,” or otherwise.

(2) “Executor” means any executor of the will or administrator of the estate of a decedent except an ancillary administrator.

(3) “Interested person” means any person who may be entitled to receive or who has received any property or interest which may be required to be considered in computing the death tax of any state involved.

(4) “State” means any state, territory or possession of the United States and the District of Columbia.

(5) “Taxing official” means the Secretary of Finance in this State and the officer or body in any other reciprocal state designated in the statute of such state substantially similar to this chapter.