definition of
invade

[1] #1 invade v. [occupy] march aggressively into another's territory by military force for the purposes of conquest and occupation; "Hitler invaded Poland on September 1, 1939". wn

[2] #2 invade v. [intrude on, obtrude upon, encroach upon] to intrude upon, infringe, encroach on, violate; "This new colleague invades my territory"; "The neighbors intrude on your privacy". wn

[3] #3 invade v. [overrun, infest] occupy in large numbers or live on a host; "the Kudzu plant infests much of the South and is spreading to the North". wn

[4] #4 invade v. penetrate or assault, in a harmful or injurious way; "The cancer had invaded her lungs". wn