verb (used with object), intruded, intruding.
to thrust or bring in without invitation, permission, or welcome.
Geology. to thrust or force into.
to install (a cleric) in a church contrary to the wishes of its members.
verb (used without object), intruded, intruding.
to thrust oneself without permission or welcome: to intrude upon their privacy.

1525–35; < Latin intrūdere to push in, equivalent to in- in-2 + trūdere to push

intruder, noun
intrudingly, adverb
self-intruder, noun
unintruded, adjective
unintruding, adjective
unintrudingly, adverb

4. interfere, interlope. See trespass. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intrude (ɪnˈtruːd)
vb (often foll by into, on, or upon)
1.  to put forward or interpose (oneself, one's views, something) abruptly or without invitation
2.  geology to force or thrust (rock material, esp molten magma) or (of rock material) to be thrust between solid rocks
[C16: from Latin intrūdere to thrust in, from in-² + trūdere to thrust]

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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Example sentences
Politics, he said, should not intrude into university life.
Nails aren't pounded into trees, and guides create routes that scarcely intrude
  upon the soaring, bromeliad-clad forest.
The third, mysterious figure is an artist with words, which he uses to intrude
  into the couple's relationship.
It was sequestered, for six months, from those who would intrude.
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