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migration

[mahy-grey-shuh n] /maɪˈgreɪ ʃən/
noun
1.
the process or act of migrating.
2.
a migratory movement:
preparations for the migration.
3.
a number or body of persons or animals migrating together.
4.
Chemistry. a movement or change of position of atoms within a molecule.
5.
Physics. diffusion (def 3a).
Origin
1605-1615
1605-15; < Latin migrātīon- (stem of migrātiō). See migrate, -ion
Related forms
migrational, adjective
nonmigration, noun
premigration, adjective
remigration, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for migration
  • The mechanical cotton picker spurred a migration to northern cities-and the civil rights movement.
  • As humans populate formerly wild regions, they increasingly intersect bird migration patterns.
  • Scientists have finally located the 24-hour clock that guides the migration of monarch butterflies.
  • It's a reference to the average miles food travels to your plate and the gallons of fuel used in its migration.
  • Even the church's language is rooted in migration.
  • With that appointment, Jack began a career-long migration in search of permanent employment.
  • As any scholar of immigration can tell you, both "push" and "pull" factors explain transnational migration.
  • And simply preparing for migration can compromise animals' immune systems.
  • The big schools had not arrived yet, no doubt because warm water forestalled their migration from the north.
  • Demonstrated experience in planning and maintenance of integrated library system upgrades, migration, etc.
British Dictionary definitions for migration

migration

/maɪˈɡreɪʃən/
noun
1.
the act or an instance of migrating
2.
a group of people, birds, etc, migrating in a body
3.
(chem) a movement of atoms, ions, or molecules, such as the motion of ions in solution under the influence of electric fields
Derived Forms
migrational, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for migration
n.

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- (cf. Greek ameibein "to change"), from root *mei- "to change, go, move" (see mutable). Related: Migrational.

That European birds migrate across the seas or to Asia was understood in the Middle Ages, but subsequently forgotten. Dr. Johnson held that swallows slept all winter in the beds of rivers, while the naturalist Morton (1703) stated that they migrated to the moon. As late as 1837 the "Kendal Mercury" "detailed the circumstance of a person having observed several Swallows emerging from Grasmere Lake, in the spring of that year, in the form of 'bell-shaped bubbles,' from each of which a Swallow burst forth ...."

Online Etymology Dictionary, © 2010 Douglas Harper
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migration in Medicine

migration mi·gra·tion (mī-grā'shən)
n.

  1. The moving from place to place, as of disease symptoms.

  2. See diapedesis.

  3. The movement of a tooth or teeth out of normal position.

  4. The movement of one or more atoms from one position to another within a molecule.

  5. The movement of ions between electrodes during electrolysis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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migration in Science
migration
  (mī-grā'shən)   
  1. The seasonal movement of a complete population of animals from one area to another. Migration is usually a response to changes in temperature, food supply, or the amount of daylight, and is often undertaken for the purpose of breeding. Mammals, insects, fish, and birds all migrate. The precise mechanism of navigation during migration is not fully understood, although for birds it is believed that sharp eyesight, sensibility to the Earth's magnetic field, and the positions of the Sun and other stars may play a role.

  2. The movement of one atom or more, or of a double bond, from one position to another within a molecule.

  3. The movement of ions between electrodes during electrolysis.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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