<p><strong>Verb (used with object)</strong></p><ul><li>to enter forcefully as an enemy; go into with hostile intent: Germany invaded Poland in 1939</li><li>Synonyms: attack, penetrate</li><li>to enter like an enemy: Locusts invaded the fields</li><li>Synonyms: attack, penetrate</li><li>to enter as if to take possession: to invade a neighbor's home</li><li>to enter and affect injuriously or destructively, as disease: viruses that invade the bloodstream</li><li>to intrude upon: to invade the privacy of a family</li><li>to encroach or infringe upon: to invade the rights of citizens</li><li>to permeate: The smell of baking invades the house</li><li>to penetrate; spread into or over: The population boom has caused city dwellers to invade the suburbs</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to make an invasion: troops awaiting the signal to invade</li></ul>