A person who leaves his/her country of origin to seek residence in another country.
A person who (1) belongs to a normally migratory culture who may cross national boundaries, or (2) has fled his or her native country for economic reasons rather than fear of political or ethnic persecution.
The BBC uses the term migrant to refer to all people on the move who have yet to complete the legal process of claiming asylum. This group includes people fleeing war-torn countries such as Syria, who are likely to be granted refugee status, as well as people who are seeking jobs and better lives, who governments are likely to rule are economic migrants.
Migrant has been defined 6 different ways in documents like Homeland Security Terminology, Department of Defense Dictionary of Military and Associated Terms, Migration and Home Affairs Glossary, and 3 more.