[in.vade] vt in.vad.ed ; in.vad.ing [ME, fr. L invadere, fr. in- + vadere to go--more at wade] (15c) 1: to enter for conquest or plunder
2: to encroach upon: infringe 3 a: to spread over or into as if invading: permeate "doubts ~ his mind" b: to affect injuriously and progressively "gangrene ~s healthy tissue" syn see trespass -- in.vad.er n