1. (noun)invasion the act of invading; the act of an army that invades for conquest or plunder
2. (noun)invasion, encroachment, intrusion any entry into an area not previously occupied "an invasion of tourists"; "an invasion of locusts"
3. (noun)invasion (pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body "the tumor's invasion of surrounding structures"
Definition of 'invasion'
