migration
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GC: n

S: IFRC – https://bit.ly/1oyhgL7 (last access: 13 April 2017); BBC – https://bbc.in/2hoOgba (last access: 13 April 2017).

N: 1. 1610s, of persons, 1640s of animals, from Latin migrationem (nominative migratio) “a removal, change of abode, migration,” noun of action from past participle stem of migrare “to move from one place to another,” probably originally *migwros, from PIE *meigw- (source of Greek ameibein “to change”), from root *mei- “to change, go, move”. Related: Migrational.
2. Population movement from one place of residence to another especially from one country to another.
3. Human migration, the permanent change of residence by an individual or group; it excludes such movements as nomadism, migrant labour, commuting, and tourism, all of which are transitory in nature.
4. Migration, in ethology, the regular, usually seasonal, movement of all or part of an animal population to and from a given area. Familiar migrants include many birds; hoofed animals, especially in East Africa and in the Arctic tundra; bats; whales and porpoises; seals; and fishes, such as salmon.
Migration can be contrasted with emigration, which involves a change in location not necessarily followed by a return journey; invasion or interruption, both of which involve the appearance and subsequent disappearance of great numbers of animals at irregular times and locations; and range expansion.
5. In the fields of Information Processing (Informatics). data migration or migration is the moving of data from an on-line service to an off-line service or low-priority device, as determined by the system or as requested by the user.
6. In the field of Chemistry, migration is the intramolecular transfer of an atom or group (of atoms) during the course of a molecular rearrangement.

S: 1. OED – https://bit.ly/2RHFDX6 (last access: 13 April 2017). 2. TERMIUM PLUS – https://bit.ly/2GbVmwh (last access: 13 April 2017). 3 & 4. EncBrit – https://bit.ly/2Srzvqp; https://bit.ly/2Gp5hxY (last access: 13 April 2017). 5 & 6. TERMIUM PLUS – http://goo.gl/W90dc5 (last access: 13 April 2017).

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CR: acculturation, concertina wire, emigrant, emigration, forced migration, immigrant, immigration, irregular migration, refugee.