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migration

 [mahy-grey-shuhn]   Origin

mi·gra·tion

   [mahy-grey-shuhn]
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).
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Origin:
1605–15; < Latin migrātīon- (stem of migrātiō). See migrate, -ion

Related forms
mi·gra·tion·al, adjective
non·mi·gra·tion, noun
pre·mi·gra·tion, adjective
re·mi·gra·tion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Migration is always a great word to know.
So is fluoride. Does it mean:
a substance that, because of the reactions it causes, is used in analysis and synthesis
a salt of hydrofluoric acid consisting of fluorine, as sodium fluoride, NaF, or a compound containing fluorine, as methyl fluoride, CH3F
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Collins
World English Dictionary
migration (maɪˈɡreɪʃən)
 
—n
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
 
mi'grational
 
—adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

migration
1610s, of persons, 1640s of animals, from L. migrationem (nom. migratio), from pp. stem of migrare "to move from one place to another," probably originally *migwros, from PIE *meigw- (cf. Gk. ameibein "to change"), from base *mei- "to change, go, move" (see mutable). That
EXPAND
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.
COLLAPSE
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
migration   (mī-grā'shən)  Pronunciation Key 

  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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