The meaning of Invasion and additional information.

Invasion(n.) The act of invading; the act of encroaching upon the rights or possessions of another; encroachment; trespass.

Invasion(n.) A warlike or hostile entrance into the possessions or domains of another; the incursion of an army for conquest or plunder.

Invasion(n.) The incoming or first attack of anything hurtful or pernicious; as, the invasion of a disease.