an act or instance of subducting; subtraction or withdrawal.
Geology. the process by which collision of the earth's crustal plates results in one plate's being drawn down or overridden by another, localized along the juncture (subduction zone) of two plates.

1570–80; < Latin subductiōn-, stem of subductiō pulling up, computation; see subduct, -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
subduction (səbˈdʌkʃən)
1.  the act of subducting, esp of turning the eye downwards
2.  geology the process of one tectonic plate sliding under another, resulting in tensions and faulting in the earth's crust, with earthquakes and volcanic eruptions

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

c.1620, "withdrawal, removal," from L. subductionem (nom. subductio), from subductus, pp. of subducere (see subduce). Geological sense is attested from 1970, from Fr. (1951).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
subduction   (səb-dŭk'shən)  Pronunciation Key 
A geologic process in which one edge of one lithospheric plate is forced below the edge of another. The denser of the two plates sinks beneath the other. As it descends, the plate often generates seismic and volcanic activity (from melting and upward migration of magma) in the overriding plate. Compare obduction.

subduct verb
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Many of the world's largest earthquakes take place at subduction zones where
  tectonic plates collide, forcing one under the other.
Water is key to subduction, and subduction seems to be what is unique.
In this respect the mixing hypothesis makes good sense in many andesites in
  subduction zone environments.
The melting of the rock occurs at the subduction zones as one plate is pushed
  under the other.
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