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

subduction zone
geology a long narrow, often arcuate, zone along which subduction takes place

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
subduction zone  
A convergent plate boundary where one plate subducts beneath the other, usually because it is denser. The western coast of South America is roughly coincident with a subduction zone in which a plate consisting of ocean floor is subducting beneath the continental mass of South America.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Since this occurs at same depth along the subduction zone a chain of volcanoes develops.
The location where sinking of a plate occurs is called a subduction zone.
Evidence for past great earthquakes on the subduction zone is extensive.
Schematic diagram of a subduction zone, showing the location of the outer rise and tensional stresses within the subducting plate.
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