migration

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Migration Definition
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–noun

the process or act of migrating.

a migratory movement: preparations for the migration.

a number or body of persons or animals migrating together.

Chemistry . a movement or change of position of atoms within a molecule.

Physics . diffusion ( def. 3a ) .

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Origin:
1605–15; < L migrātīon- (s. 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

–noun

act of diffusing; state of being diffused.

prolixity of speech or writing; discursiveness.

Physics .

Also called migration. an intermingling of molecules, ions, etc., resulting from random thermal agitation, as in the dispersion of a vapor in air.

a reflection or refraction of light or other electromagnetic radiation from an irregular surface or an erratic dispersion through a surface; scattering.

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.

Meteorology . the spreading of atmospheric constituents or properties by turbulent motion as well as molecular motion of the air.

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

—Related forms

in·ter·dif·fu·sion, noun

non·dif·fu·sion, noun

o·ver·dif·fu·sion, noun

re·dif·fu·sion, noun

self-dif·fu·sion, noun

—Can be confused: diffraction, diffusion, reflection, rarefaction, refraction.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2010.
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Link To migration

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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Word Origin & History

diffusion

late 14c., from L. diffusionem , from stem of diffundere "scatter, pour out," from dif- "apart, in every direction" + fundere "pour" (see found (2)).

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 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, © 2010 Douglas Harper
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Medical Dictionary

dif·fu·sion definition

Pronunciation: /dif-ˈy{uuml}-zhən/
Function: n
1 : the process whereby particles of liquids, gases, or solids 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 Pronunciation: /-ˈy{uuml}zh-nəl, -ən- ^əl/
Function: adj

mi·gra·tion definition

Pronunciation: /mī-ˈgrā-shən/
Function: n
: the act, process, or an instance of migrating < migration of larval nematodes to the lungs>

Merriam-Webster's Medical Dictionary, © 2007 Merriam-Webster, Inc.
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diffusion dif·fu·sion (dĭ-fy&oomacr;'zhən)
n.

The process of diffusing or the condition of being diffused.
The spontaneous intermingling of the particles of two or more substances as a result of random thermal motion.
See dialysis.

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

The moving from place to place, as of disease symptoms.
See diapedesis.
The movement of a tooth or teeth out of normal position.
The movement of one or more atoms from one position to another within a molecule.
The movement of ions between electrodes during electrolysis.

Science Dictionary

diffusion (dĭ-fy

'zhən) Pronunciation Key

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.
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

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.
The movement of one atom or more, or of a double bond, from one position to another within a molecule.
The movement of ions between electrodes during electrolysis.