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migration

 - 12 dictionary results
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mi⋅gra⋅tion

  [mahy-grey-shuhn]
Use migration in a Sentence
–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:
1605–15; < L migrātīon- (s. of migrātiō). See migrate, -ion

Related forms:
mi⋅gra⋅tion⋅al, adjective
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dif⋅fu⋅sion

  [di-fyoo-zhuhn]
–noun
1. act of diffusing; state of being diffused.
2. prolixity of speech or writing; discursiveness.
3. Physics.
a. Also called migration. an intermingling of molecules, ions, etc., resulting from random thermal agitation, as in the dispersion of a vapor in air.
b. a reflection or refraction of light or other electromagnetic radiation from an irregular surface or an erratic dispersion through a surface; scattering.
4. Movies. a soft-focus effect resulting from placing a gelatin or silk plate in front of a studio light or a camera lens, or through the use of diffusion filters.
5. Meteorology. the spreading of atmospheric constituents or properties by turbulent motion as well as molecular motion of the air.
6. Anthropology, Sociology. the transmission of elements or features of one culture to another.
Origin:
1325–75; ME < L diffūsiōn- (s. of diffūsiō) a spreading out, equiv. to diffūs(us) (see diffuse ) + -iōn- -ion
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To migration
mi·gra·tion   (mī-grā'shən)   
n.  

  1. The act or an instance of migrating.

  2. A group migrating together.

  3. Chemistry & Physics

    1. The movement of one atom or more from one position to another within a molecule.

    2. The movement of ions between electrodes during electrolysis.

mi·gra'tion·al adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Cultural Dictionary

diffusion

The spreading of atoms or molecules of one substance through those of another, especially into liquids or gases.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Word Origin & History

diffusion 
c.1374, from L. diffusionem, from stem of diffundere "scatter, pour out," from dif- "apart, in every direction" + fundere "pour" (see found (2)).

migration 
1611, of persons, 1646 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). Migrate is first attested 1697. 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.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: dif·fu·sion
Pronunciation: dif-'yü-zh&n
Function: noun
1 : the process whereby particles of liquids, gases, orsolids intermingle as the result of their spontaneous movement caused by thermal agitation and in dissolved substances move from a region of higher to one of lower concentration
2 a : reflection of light by a rough reflecting surface b : transmission of light through a translucent material —dif·fu·sion·al /-'yüzh-n&l, -&n-&l/ adjective

Main Entry: mi·gra·tion
Pronunciation: mI-'grA-sh&n
Function: noun
: the act, process, or an instance of migrating <migration ofthe upper front teeth> <migrations of the eye worm through the tissues of the body>
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

diffusion dif·fu·sion (dĭ-fy&oomacr;'zhən)
n.

  1. The process of diffusing or the condition of being diffused.

  2. The spontaneous intermingling of the particles of two or more substances as a result of random thermal motion.

  3. See dialysis.

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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Science Dictionary
diffusion   (dĭ-fy'zhən)  Pronunciation Key 

  1. The movement of atoms or molecules from an area of higher concentration to an area of lower concentration. Atoms and small molecules can move across a cell membrane by diffusion. Compare osmosis.

  2. The reflection or refraction of radiation such as light or sound by an irregular surface, tending to scatter it in many directions.


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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