Invasion

·noun The incoming or first attack of anything hurtful or pernicious; as, the invasion of a disease.

II. Invasion ·noun The act of invading; the act of encroaching upon the rights or possessions of another; encroachment; trespass.

III. Invasion ·noun A warlike or hostile entrance into the possessions or domains of another; the incursion of an army for conquest or plunder.