v.
Pronunciation: in- ' v ā d
Function: transitive verb
Inflected Form: in · vad · ed ; in · vad · ing
Etymology: Middle English, from Latin invadere, from in- + vadere to go ― more at WADE
Date: 15th century
1 : to enter for conquest or plunder
2 : to encroach upon : INFRINGE
3 a : to spread over or into as if invading : PERMEATE <doubts invade his mind> b : to affect injuriously and progressively <gangrene invade s healthy tissue>
synonyms see TRESPASS
– in · vad · er noun