What does the term Executor mean in respect to an estate tax return ?

The term executor means the executor, personal representative, or administrator of the decedent’s estate. If none of these is appointed, qualified, and acting in the United States, every person in actual or constructive possession of any property of the decedent is considered an executor and must file a tax return. IRS Form 706 is the form that must be filed. Speak to your local CPA about the filing requirements.