migration
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migration
[mī′grā·shən] (chemistry)
The movement of an atom or group of atoms to new positions during the course of a molecular rearrangement.
(chemical engineering)
(computer science)
Movement of frequently used data items to more accessible storage locations, and of infrequently used data items to less accessible locations.
(genetics)
The transfer of genetic information among populations by the movement of individuals or groups of individuals from one population into another.
(geology)
Movement of a topographic feature from one place to another, especially movement of a dune by wind action.
Movement of liquid or gaseous hydrocarbons from their source into reservoir rocks.
(hydrology)
Slow, downstream movement of a system of meanders.
(metallurgy)
The uncontrolled movement of certain metals, particularly silver, from one location to another, usually with associated undesirable effects such as oxidation or corrosion.
(solid-state physics)
The movement of charges through a semiconductor material by diffusion or drift of charge carriers or ionized atoms.
The movement of crystal defects through a semiconductor crystal under the influence of high temperature, strain, or a continuously applied electric field.
(vertebrate zoology)
Periodic movement of animals to new areas or habitats.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
migration
the movement of people from one country to another, involving an intention to reside in the country of destination. Emigration refers to the movement out of a country, immigration refers to the movement of people into a country. There is an internationally agreed definition of an immigrant as someone who, having lived outside the country for at least one year, declares an intention to live in the country for at least one year. An emigrant is defined in the opposite way Since World War II more people have emigrated from the UK than immigrated into it. In recent British history there have been three periods of marked immigration: Irish people 1800-61; Jewish people 1870-1911; and people from the New Commonwealth 1950-71. There have been a number of MORAL PANICS about immigration since 1945, focusing on the immigration of black people, and it is therefore important to distinguish between immigrants and black people; it is wrong to assume that an immigrant is black, and it is equally wrong to assume that a black person is an immigrant. See also LABOUR MIGRATION, ETHNIC GROUP, RACISM OR RACIALISM.Collins Dictionary of Sociology, 3rd ed. © HarperCollins Publishers 2000
migration
The spreading or creeping of a sealant onto adjacent surfaces, usually to the detriment of bond.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.