The Oxford Thesaurus An A-Z Dictionary of Synonyms - imperialadj.

1) kingly, kinglike, queenly, queenlike, princely, princelike, regal, royal, sovereign: The imperial court was rich and splendid. 2) majestic, royal, regal, lofty, exalted, supreme, august, noble, superior, imposing, splendid, magnificent, grand, excellent: Her imperial presence outshone all at the ball.