The term ’empire’ refers to a group of nations or states
brought under a single sovereign authority. For an earlier period
it also stood for a state that was characterized by the dominion
of a conquering nation over the conquered people. Thus were founded
the empires of ancient Egypt, Mesopotamia, Asyria and Persia. The
activity of empire building was also carried out by the Mongols,
Muhammedans, Turks and Tartars in medieval Europe. The term "imperial"
means ’of’ or ’belonging to’ an empire or emperor. It could also
mean ’of’ or ’belonging or pertaining to’ a state that is supreme
over colonies, dependencies or protectorates.