Thayer's Greek Lexicon

 1. royal power, kingship, dominion, rule
  1) not to be confused with an actual kingdom but rather the
right or authority to rule over a kingdom
  2) of the royal power of Jesus as the triumphant Messiah
  3) of the royal power and dignity conferred on Christians in the
Messiah's kingdom
2. a kingdom, the territory subject to the rule of a king
3. used in the N.T. to refer to the reign of the Messiah