[ in-vey-zhuhn ]
See synonyms for invasion on
  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.

  1. entrance as if to take possession or overrun: the annual invasion of the resort by tourists.

  2. infringement by intrusion.

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

Other words from invasion

  • pre·in·va·sion, adjective
  • re·in·va·sion, noun

Words Nearby invasion Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use invasion in a sentence

British Dictionary definitions for invasion


/ (ɪnˈveɪʒən) /

  1. the act of invading with armed forces

  2. any encroachment or intrusion: an invasion of rats

  1. the onset or advent of something harmful, esp of a disease

  2. pathol the spread of cancer from its point of origin into surrounding tissues

  3. 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