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verb (used with object), in·vad·ed, in·vad·ing.
  1. to enter forcefully as an enemy; go into with hostile intent: Germany invaded Poland in 1939.
  2. to enter like an enemy: Locusts invaded the fields.
  3. to enter as if to take possession: to invade a neighbor's home.
  4. to enter and affect injuriously or destructively, as disease: viruses that invade the bloodstream.
  5. to intrude upon: to invade the privacy of a family.
  6. to encroach or infringe upon: to invade the rights of citizens.
  7. to permeate: The smell of baking invades the house.
  8. to penetrate; spread into or over: The population boom has caused city dwellers to invade the suburbs.
verb (used without object), in·vad·ed, in·vad·ing.
  1. to make an invasion: troops awaiting the signal to invade.

Origin of invade

1485–95; < Latin invādere, equivalent to in- in-2 + vādere to go; see wade
Related formsin·vad·a·ble, adjectivein·vad·er, nounqua·si-in·vad·ed, adjectivere·in·vade, verb (used with object), re·in·vad·ed, re·in·vad·ing.un·in·vad·a·ble, adjectiveun·in·vad·ed, adjective

Synonyms for invade

See more synonyms for on Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for invader

alien, intruder

Examples from the Web for invader

Contemporary Examples of invader

Historical Examples of invader

British Dictionary definitions for invader


  1. to enter (a country, territory, etc) by military force
  2. (tr) to occupy in large numbers; overrun; infest
  3. (tr) to trespass or encroach upon (privacy, etc)
  4. (tr) to enter and spread throughout, esp harmfully; pervade
  5. (of plants, esp weeds) to become established in (a place to which they are not native)
Derived Formsinvadable, adjectiveinvader, noun

Word Origin for invade

C15: from Latin invādere, from vādere to go
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 invader

1540s, agent noun from invade.



late 15c., from Middle French invader "to invade," and directly from Latin invadere "to go into, enter upon; assail, assault, attack" (see invasion). Related: invaded; invading.

Online Etymology Dictionary, © 2010 Douglas Harper