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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
   "the Kudzu plant invades much of the South and is spreading to the North";
   - overrun, infest
    
4. Penetrate or assault, in a harmful or injurious way
   "The cancer had invaded her lungs"

Derived forms: invading, invades, invaded

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

Encyclopedia: Invade