invasion

The act of invading, especially the entrance of an armed force into a territory to conquer.

The entry into bodily tissue and subsequent proliferation of an injurious entity, such as a pathogen or tumor.

An intrusion or encroachment.

The act of invading a country or territory as an enemy; hostile entrance or intrusion.

Hence A harmful incursion of any kind; an onset or attack, as of disease.

Infringement by intrusion; encroachment by entering into or taking away what belongs to another: as, an invasion of one’s retirement or rights.

In phytogeography, the phenomenon of the movement of plants from an area of one character into one of a different character, and their colonization in the latter.

The act of invading; the act of encroaching upon the rights or possessions of another; encroachment; trespass.

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

The incoming or first attack of anything hurtful or pernicious.