an act or instance of intruding.
the state of being intruded.
an illegal act of entering, seizing, or taking possession of another's property.
a wrongful entry after the determination of a particular estate, made before the remainderman or reversioner has entered.
emplacement of molten rock in preexisting rock.
plutonic rock emplaced in this manner.
a process analogous to magmatic intrusion, as the injection of a plug of salt into sedimentary rocks.
the matter forced in.

1250–1300; Middle English < Medieval Latin intrūsiōn- (stem of intrūsiō), equivalent to Latin intrūs(us), past participle of intrūdere to intrude (equivalent to intrūd- verb stem + -tus past participle suffix, with dt < s) + -iōn- -ion

intrusional, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intrusion (ɪnˈtruːʒən)
1.  the act or an instance of intruding; an unwelcome visit, interjection, etc: an intrusion on one's privacy
2.  a.  the movement of magma from within the earth's crust into spaces in the overlying strata to form igneous rock
 b.  any igneous rock formed in this way
3.  property law an unlawful entry onto land by a stranger after determination of a particular estate of freehold and before the remainderman or reversioner has made entry

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

late 14c., from O.Fr. intrusion, from M.L. intrusionem (nom. intrusio) "a thrusting in," from L. intrusus, pp. of intrudere, from in- "in" + trudere "to thrust, push" (see extrusion). Intrude is first recorded 1530s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
intrusion   (ĭn-tr'zhən)  Pronunciation Key 
The movement of magma through cracks in underground rocks within the Earth, usually in an upward direction. ◇ Rocks that form from the underground cooling of magma are generally coarse-grained (because they cool slowly so that large crystals have time to grow) and are called intrusive rocks. Compare extrusion.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Yet doing so would reopen old wounds relating to civil rights, governmental
  intrusion into hiring decisions, etc.
Some newspapers will cavil, arguing that without sensation and intrusion they
  cannot survive.
Others fret over state intrusion and social strictures.
Another example of the insane and ignorant government intrusion into our
  private lives.
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