Main Entry: in·vade

Pronunciation: \in-ˈvād\

Function: transitive verb

Inflected Form(s): 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 invades healthy tissue>

synonyms see trespass

— in·vad·er noun