"invasion" in the noun sense

1. invasion

the act of invading the act of an army that invades for conquest or plunder

2. invasion, encroachment, intrusion

any entry into an area not previously occupied

"an invasion of tourists"

"an invasion of locusts"

3. invasion

pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body

"the tumor's invasion of surrounding structures"

Source: WordNet® (An amazing lexical database of English)

Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.

View WordNet® License