Immigration n. : The act of immigrating; the passing or coming into a country for the purpose of permanent residence.

Example:
What do Immigration attorneys actually do?

Taxonomy
USCIS, Green Card, Family, CUSTOMER TOOLS, Application, Case Services, Citizenship, My Case, Refugees, Immigration & Customs Enforcement, Case Status, Employers, Employees, Workers, Parents, Naturalization Test, Asylees, Adoption.

Defination from the web:
immigration forms, laws and regulations, and field office information. Formerly known as the Immigration and Naturalization Service (INS)