means any person to whom letters of administration or of executorship have been granted by a Master in respect of the estate of a deceased person under any law relating to the administration of estates, or whose appointment as assumed executor of such an estate has been endorsed by a Master under such law, or who liquidates or distributes such an estate in pursuance of a direction of a Master, and includes a person acting or authorized to act under letters of administration or of executorship granted outside the Republic but signed and sealed by a Master for use within the Republic and, in any case where the estate is not required to be administered under the supervision of the Master, the person administering the estate.