preconduction

conduction

[kuhn-duhk-shuhn]
noun
1.
the act of conducting, as of water through a pipe.
2.
Physics.
a.
the transfer of heat between two parts of a stationary system, caused by a temperature difference between the parts.
b.
transmission through a conductor.
3.
Physiology. the carrying of sound waves, electrons, heat, or nerve impulses by a nerve or other tissue.

Origin:
1530–40; < Latin conductiōn- (stem of conductiō) a bringing together, a hiring, equivalent to conduct(us) (see conduct) + -iōn- -ion

conductional, adjective
preconduction, noun
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World English Dictionary
conduction (kənˈdʌkʃən)
 
n
1.  Compare convection the transfer of energy by a medium without bulk movement of the medium itself: heat conduction,; electrical conduction,; sound conduction
2.  the transmission of an electrical or chemical impulse along a nerve fibre
3.  the act of conveying or conducting, as through a pipe
4.  physics another name for conductivity
 
con'ductional
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

conduction
1540s, "leading, guidance," from L. conductionem, noun of action from conducere (see conduce). Sense of "conducting of a liquid through a channel" is from 1610s; in physics, of heat, etc., from 1814.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

conduction con·duc·tion (kən-dŭk'shən)
n.
The transmission or conveying of something through a medium or passage, especially the transmission of electric charge or heat through a conducting medium without perceptible motion of the medium itself.

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
conduction   (kən-dŭk'shən)  Pronunciation Key 
The transfer of energy, such as heat or an electric charge, through a substance. In heat conduction, energy is transferred from molecule to molecule by direct contact; the molecules themselves do not necessarily change position, but simply vibrate more or less quickly against each other. In electrical conduction, energy is transferred by the movement of electrons or ions. Compare convection. See also radiation.

Our Living Language  : Heat is a form of energy that manifests itself in the motion of molecules and atoms, as well as subatomic particles. Heat energy can be transferred by conduction, convection, or radiation. In conduction heat spreads through a substance when faster atoms and molecules collide with neighboring slower ones, transferring some of their kinetic energy to them. This is how the handle of a teaspoon sticking out of a cup of hot tea eventually gets hot, though it is not in direct contact with the hot liquid. When a fluid is heated, portions of the fluid near the source of the heat tend to become less dense and expand outward, causing currents in the fluid. When these less dense regions rise, cooler portions flow in to take their place, which are then themselves subject to heating. This current flow is called convection. Many ocean currents are convection currents caused by the uneven heating of the ocean waters by the Sun. Radiation transmits heat in the form of electromagnetic waves, especially infrared waves, which have a lower frequency than visible light but a higher frequency than microwaves. Atoms and molecules in a substance struck by such radiation readily absorb the energy from these waves, thereby increasing their own kinetic energy and thus the temperature of the substance.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

conduction definition


Transfer of energy through a medium (for example, heat or electricity through metal) without any apparent change in the medium.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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