Which term describes a person who has been formally ordered to be removed from a country?

The term that accurately describes a person who has been formally ordered to be removed from a country is "deportee." This designation is specifically used in immigration and legal contexts where an individual is compelled to leave a country, often due to violations of immigration laws or other legal issues. The process of deportation typically involves official legal proceedings and documentation that outlines the reasons for the individual's removal.

In contrast, the other terms do not relate to the concept of being removed from a country. A "deplaining point" refers to the location where passengers disembark from an aircraft. "First rider" is not a recognized term in this context and does not relate to immigration or deportation scenarios. A "diverted flight" describes an aircraft that has been redirected from its planned route, which is unrelated to the status of an individual in a legal or immigration sense. Therefore, "deportee" is the most accurate and relevant term.