- noun the act of controlling other countries as if they were part of an empire. Although imperialism is used to refer to states which have or had colonies (such as Britain, France, Belgium and the Netherlands) it is now widely used to refer to states which exert strong influence over other states. This influence can be political, military or commercial.
- noun the policy or practice of one country ruling over one or more others by means of physical occupation and the assumption of governmental powers
- noun the practice of controlling other countries as if they were part of an empire