An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) A political unit having an extensive territory or comprising a number of territories or nations and ruled by a single supreme authority.
2) The territory included in such a unit (TheFreeDictionary).

M.E., from O.Fr. empire "rule, authority, kingdom," from L. imperium "command, dominion, sovereignty," from → imperare "to command."

Parmâtgân, from parmât, present stem of parmâtidan, → imperare, + -gân suffix denoting relation and place appearinfg in the name of lands and localities (Šâpurgân, Gorgân, Golpâyegân, etc.).