in·va·sion

[in-vey-zhuhn]
noun
1.
an act or instance of invading or entering as an enemy, especially by an army.
2.
the entrance or advent of anything troublesome or harmful, as disease.
3.
entrance as if to take possession or overrun: the annual invasion of the resort by tourists.
4.
infringement by intrusion.

Origin:
1400–50; late Middle English < Late Latin invāsīon- (stem of invāsiō), equivalent to invās(us), past participle of invādere + -iōn- -ion; see invade

pre·in·va·sion, adjective
re·in·va·sion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To invasion
00:10
Invasion is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a gadget; dingus; thingumbob.
Collins
World English Dictionary
invasion (ɪnˈveɪʒən) [Click for IPA pronunciation guide]
 
n
1.  the act of invading with armed forces
2.  any encroachment or intrusion: an invasion of rats
3.  the onset or advent of something harmful, esp of a disease
4.  pathol the spread of cancer from its point of origin into surrounding tissues
5.  the movement of plants to a new area or to an area to which they are not native

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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Etymonline
Word Origin & History

invasion
1439, from M.Fr. invasion (12c.), from L.L. invasionem (nom. invasio) "an attack, invasion," from L. invasus, pp. of invadere "go into, fall upon, attack, invade," from in- "in" + vadere "go, walk" (see vamoose). Invade is 1491, from invadere.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Those who always opposed the invasion point to post-war violence and anarchy as
  a big justification for their position.
The idea, moreover, that democracy can be established by military invasion is
  not bolstered with much historical evidence.
There's lots of science fiction built around the idea of alien invasion.
Invasion of exotic species can harm native animals and plants.
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