What is also known as a centralized government?

"Centralized government" can have several somewhat distinct meanings in varying contexts. In general, the term refers to the government of a unitary state; that is, one that is a not a federation, such as those of Canada or the United States, which are nations that have dually-sovereign federal and subnational governments. Two examples are that of the United Kingdom of Great Britain and Northern Ireland or of the Republic of Ireland, both of which are unitary states with thereby centralized governments.