Imperialism has changed since industrialization. Another, more specific, definition is the following. In modern times, imperialism refers to the domination of world powers over subject lands. Sometimes it is done by force of arms (as it was done before industrialization--think the Roman Empire). But in the modern era, it more often happens through subtle means. It arises from trade, investment, and business--that is, primarily economic activities--that enable imperial powers to profit from third world nations and influence their affairs without exercising direct political control (as was done during the colonial era). These dominant powers may not necessarily refer to themselves as empires, but historians will often use the term "empire" to describe those powers.
Using this definition, are there modern examples you can think of?