An empire is a sovereign state consisting of several territories and peoples subject to a single ruling authority, often an emperor. States can be empires either by narrow definition through having an emperor and being named as such, or by broad definition as stated above in being an aggregated realm under the rule of a supreme authority.
An empire can be made solely of contiguous territories, such as the Austro-Hungarian Empire or the Russian Empire, or include territories which are far remote from the 'home' country of the empire, such as a colonial empire. Aside from the more formal usage, the word empire can also refer colloquially to a large-scale business enterprise (e.g. a transnational corporation), a political organisation controlled by a single individual (a political boss), or a group (political bosses). The concept of empire is associated with other such concepts as imperialism, colonialism, and globalization, with imperi…Read more on Wikipedia