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

1485–95; < Latin invādere, equivalent to in- in-2 + vādere to go; see wade

invadable, adjective
invader, noun
quasi-invaded, adjective
reinvade, verb (used with object), reinvaded, reinvading.
uninvadable, adjective
uninvaded, adjective

1, 2. penetrate, attack. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To invade
World English Dictionary
invade (ɪnˈveɪd)
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)
[C15: from Latin invādere, from vādere to go]

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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Example sentences
They are definitely aware when you can see them and are less likely to invade
  your space when they know they have been seen.
Voracious, venomous lionfish are the first exotic species to invade coral reefs.
If humans didn't make it so easy for them, invasive fire ants wouldn't invade.
After multiplying, the microbes break out of the cell and go on to invade other
  cells, repeating the process.
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