[ 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.

Nearby words

  1. invariable,
  2. invariably,
  3. invariance,
  4. invariant,
  5. invariant mass,
  6. invasion of privacy,
  7. invasive,
  8. invected,
  9. invective,
  10. invectively

Origin of invasion

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

Related formspre·in·va·sion, adjectivere·in·va·sion, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for invasion

British Dictionary definitions for invasion


/ (ɪnˈveɪʒən) /


the act of invading with armed forces
any encroachment or intrusionan 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

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