What is the best definition of a resident alien? a resident alien is a person who lives in a country but is not a citizen of that country. a resident alien is a person who was an immigrant but has become a citizen of the country. a resident alien is a person who wants to move to another country for school or work. a resident alien is a person who was living in another country illegally and has been deported.

The answer is

A resident alien is a person who lives in a country but not a citizen of that country

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The best definition of a resident alien is:

A resident alien is a person who lives in a country but is not a citizen of that country.  

A resident alien also is known as a permanent resident is a person who lives permanently in a country but not a citizen of the country. In USA, a permanent resident must have a green card or already passed a substantial presence test. This resident alien or permanent resident also pay taxes as the same to the citizen.  

There are types of resident alien according to United States Citizenship and Immigration Services (USCIS):

1. A Permanent Resident is someone who is granted lawfully and legally by the government to live permanently in a country.

2. A Conditional Resident is someone who receives a two year Green Card, it was usually given to someone who married to the citizen of that country.

3. A Returning Resident is someone who has been granted a permanent resident but has been outside the US and returning to the country. He or she needs to apply for readmission if they already outside the USA for more than 180 days.