| verb | march aggressively into another's territory by military force for the purposes of conquest and occupation “Hitler invaded Poland on September 1, 1939” |
| verb | to intrude upon, infringe, encroach on, violate “This new colleague invades my territory” |
| verb | occupy in large numbers or live on a host “the Kudzu plant infests much of the South and is spreading to the North” |
| verb | penetrate or assault, in a harmful or injurious way “The cancer had invaded her lungs” |
| invasive | adjective | involving invasion or aggressive attack |
| invasion | noun | the act of invading; the act of an army that invades for conquest or plunder |
| invader | noun | someone who enters by force in order to conquer |
| occupier | noun | a member of a military force who is residing in a conquered foreign country |
| occupation | noun | the control of a country by military forces of a foreign power |
| infestation | noun | the state of being invaded or overrun by parasites |