Empire (noun)

1. A group of countries or territories ruled by a single supreme authority.
2. A vast and powerful government or organization.
3. The territory, people, and government of an empire.

Origin:

From middle english emperie, from old french empire, from latin imperium ("rule, command, sovereignty"), from imperare ("to command"), from in- ("in") + parare ("to make ready, prepare").

Examples:

1. The Roman Empire was one of the most powerful empires in history.
2. He built an empire of hotels and resorts.
3. The empire expanded its territory through conquest.
4. The empire's economy was based on agriculture.
5. The empire was ruled by an emperor.