Dictionary-Definition.com :: Invasion definition

Definition of 'invasion'

noun

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

noun

Any entry into an area not previously occupied; "an invasion of tourists"; "an invasion of locusts" [syn: invasion, encroachment, intrusion]

noun

(pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body; "the tumor's invasion of surrounding structures"

From: GCIDE

Invasion \In*va"sion\, n. [L. invasio: cf. F. invasion. See Invade.] [1913 Webster]
1. The act of invading; the act of encroaching upon the rights or possessions of another; encroachment; trespass. [1913 Webster]
2. A warlike or hostile entrance into the possessions or domains of another; the incursion of an army for conquest or plunder. [1913 Webster]
3. The incoming or first attack of anything hurtful or pernicious; as, the invasion of a disease.
Syn: Invasion, Irruption, Inroad.
Usage: Invasion is the generic term, denoting a forcible entrance into a foreign country. Incursion signifies a hasty and sudden invasion. Irruption denotes particularly violent invasion. Inroad is entry by some unusual way involving trespass and injury. [1913 Webster]