1. March aggressively into another's territory by military force for the purposes of conquest and occupation
   "Hitler invaded Poland on September 1, 1939"
   - occupy 
2. To intrude upon, infringe, encroach on, violate
   "This new colleague invades my territory"
   - intrude on, obtrude upon, encroach upon 
3. Occupy in large numbers or live on a host
   - overrun, infest 
4. Penetrate or assault, in a harmful or injurious way
   "The cancer had invaded her lungs"

Derived forms: invades, invaded, invading

See also: invader, invasion, invasive

Type of: assail, attack, come in, enter, get in, get into, go in, go into, inhabit, interpenetrate, move into, permeate

Encyclopedia: Invade

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