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[in-vey-zhuh n] /ɪnˈveɪ ʒən/
an act or instance of invading or entering as an enemy, especially by an army.
the entrance or advent of anything troublesome or harmful, as disease.
entrance as if to take possession or overrun:
the annual invasion of the resort by tourists.
infringement by intrusion.
Origin of invasion
late Middle English
1400-50; late Middle English < Late Latin invāsīon- (stem of invāsiō), equivalent to invās(us), past participle of invādere + -iōn- -ion; see invade
Related forms
preinvasion, adjective
reinvasion, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for invasion
Contemporary Examples
Historical Examples
  • On the invasion of William, as we have seen, it was in the possession of Edwin, sovereign of Deira.

    The Grand Old Man Richard B. Cook
  • Napoleon was silent a moment, as if protesting against this invasion of his privacy.

  • This was at a moment when all England was in arms, in anticipation of an invasion from France.

    Ned Myers James Fenimore Cooper
  • All those who could bear a musket were gone to meet the invasion.

    In the Valley Harold Frederic
  • I rubbed my sleepy eyes, and could not quite understand the meaning of this invasion.

    My Double Life Sarah Bernhardt
British Dictionary definitions for invasion


the act of invading with armed forces
any encroachment or intrusion: an invasion of rats
the onset or advent of something harmful, esp of a disease
(pathol) the spread of cancer from its point of origin into surrounding tissues
the movement of plants to a new area or to an area to which they are not native
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for invasion

mid-15c., from Old French invasion "invasion, attack, assaut" (12c.), from Late Latin invasionem (nominative invasio) "an attack, invasion," noun of action from past participle stem of Latin invadere "go into, fall upon, attack, invade," from in- "in" (see in- (2)) + vadere "go, walk" (see vamoose).

Online Etymology Dictionary, © 2010 Douglas Harper
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