▪ enter (a place, situation, or sphere of activity) in large numbers, especially with intrusive effect: "demonstrators invaded the Presidential Palace"Similarpermeatepervadefillspread through/overdiffuse throughimbueperfusebe disseminated throughflow throughassailattacktake over
▪ (of a parasite or disease) spread into (an organism or bodily part): "sometimes the worms invade the central nervous system"
▪ (of a person or emotion) encroach or intrude on:"he felt his privacy was being invaded"Similarintrude onviolateencroach oninfringe ontrespass onobtrude onburst in oninterruptdisturbdisruptinformal:horn in onmuscle in onarchaic:entrench onOppositerespect
Word Originlate Middle English (in the sense ‘attack or assault (a person’)): from Latin invadere, from in- ‘into’ + vadere ‘go’.