migration

any of a number of polymers containing alternate silicon and oxygen atoms and that are fluid, resinous, rubbery, extremely stable in high temperatures, and water-repellent

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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
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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

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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American Heritage

Medical Dictionary

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.

American Heritage

Science Dictionary

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.

Example sentences

The mechanical cotton picker spurred a migration to northern cities-and the

civil rights movement.

And simply preparing for migration can compromise animals' immune systems.

The perpetual migration between prison and a few predictable neighborhoods is

not only costly-it also destabilizes community life.

Whether one swamps out the effects of another is a matter of figuring out the

selection coefficients versus the migration rate.

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Matching Quote

"Electronic aids, particularly domestic computers, will help the inner migration, the opting out of reality. Reality is no longer going to be the stuff out there, but the stuff inside your head. It's going to be commercial and nasty at the same time."

-J.G. Ballard