Invasion1. (n.) The act of encroaching upon the rights or possessions of another; encroachment; trespass.
2. (n.) A warlike or hostile entrance into the possessions or domains of another; the incursion of an army for conquest or plunder.
3. (n.) The incoming or first attack of anything hurtful or pernicious; as, the invasion of a disease.
Thesaurus Entries
adoption, aggression, air attack, air raid, air strike, appropriation, arrogation, assault, assumption, attack, blitzkrieg, boarding, breach, drive, encroachment, entrance, entrenchment, escalade, fire raid, foray, impingement, imposition, incursion, infestation, infiltration, influx, infraction, infringement, injection, inroad, insinuation, interference, interjection, interloping, interposition, interposure, interruption, intervention, intrusion, irruption, lousiness, obtrusion, offense, offensive, onslaught, overrunning, overspreading, overswarming, plague, playing God, raid, ravage, razzia, saturation raid, scaling, seizure, shuttle raid, storming, swarm, swarming, teeming, transgression, trespass, trespassing, unlawful entry, usurpation, violation