Deportation is the act of throwing a foreigner out of a country, whether they are a resident or an intruder.
If you've ever heard that someone was deported — expelled from a country — then you can probably guess that deportation is the act of that happening. Deportation can involve a resident of a country who is tossed out because of a crime. Often, deportation happens to people who enter a country illegally and are caught. A citizen of a country is usually safe from deportation. Deportation means something close to exile. When you see the word deportation, think “Goodbye.”