empire

a group of nations or peoples ruled over by an emperor, empress, or other powerful sovereign or government: usually a territory of greater extent than a kingdom, as the former British Empire, French Empire, Russian Empire, Byzantine Empire, or Roman Empire.

a government under an emperor or empress.

(often initial capital letter) the historical period during which a nation is under such a government: a history of the second French empire.

supreme power in governing; imperial power; sovereignty: Austria's failure of empire in central Europe.

supreme control; absolute sway: passion's empire over the mind.

(initial capital letter) characteristic of or developed during the first French Empire, 1804–15.

(usually initial capital letter) (of women's attire and coiffures) of the style that prevailed during the first French Empire, in clothing being characterized especially by décolletage and a high waistline, coming just below the bust, from which the skirt hangs straight and loose.

(often initial capital letter) noting or pertaining to the style of architecture, furnishings, and decoration prevailing in France and imitated to a greater or lesser extent in various other countries, c1800–30: characterized by the use of delicate but elaborate ornamentation imitated from Greek and Roman examples or containing classical allusions, as animal forms for the legs of furniture, bas-reliefs of classical figures, motifs of wreaths, torches, caryatids, lyres, and urns and by the occasional use of military and Egyptian motifs and, under the Napoleonic Empire itself, of symbols alluding to Napoleon I, as bees or the letter N.