IMPE'RIAL, adjective [Latin imperialis, from impero, to command. See Emperor.]
1. Pertaining to an empire, or to an emperor; as an imperial government; an imperial diadem; imperial authority or edict; imperial power or sway.
2. Royal; belonging to a monarch; as an imperial palace; imperial arts.
3. Pertaining to royalty; denoting sovereignty.
4. Commanding; maintaining supremacy; as the imperial democracy of Athens.
Imperial chamber, the sovereign court of the German empire.
Imperial city, a city in Germany which has no head but the emperor.
Imperial diet, an assembly of all the states of the German empire.