In-Migration: The entry of individuals into one part of a nation from another part of that same nation. (I/P) x 1,000

Out-Migration: The exit of individuals from one part of a nation to another part of that same nation. (O/P) x 1,000

Involuntary Migration: Movement between populations contrary to the will of the migrant; forced migration is an extreme form of this.

Forced Migration: Movement between populations motivated by violence or its threat.

Operationalization: The act of defining a scientific term do that the term can be associated with clear observation.

Emigrants: An individual who moves from one nation to another, from the perspective of the sender nation.

Immigrants: An individual who moves from one nation to another, from the perspective of the receiver nation.

Net Migration: The difference between in-migration and out-migration. [(I-O)/P] x 1,000

Voluntary Migration: Movement between populations that is purposely undertaken to benefit the migrants; the push-pull thesis and related theoretical models focus on this kind of migration.

The Risk of a Migratory Event: Probability that a member of a specific population will migrate during a year.

Internal migration involves the movement of the people between specific territoriality based subpopulations of a larger, general population.

Intercity Migration = origin is one city and destination another.

The Great Migration: one of the highly consequential episode of inter-regional migration.

Rural Renaissance: The movement dring the late twentieth century that saw a reversal of the long-range trend in the United States of migration to cities from rural areas.

Involves the movement of individuals and groups of individuals from one country to another.

Immigration and Nationality Act: 1924 An act of the U.S. Congress that established quotas favoring immigrants from western Europe.

The decline of the 1930s marked the beginning of a period of several decades during which the international immigration virtually came to a halt.