'Invasion' definitions:

Definition of 'invasion'

(from WordNet)
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"

Definition of 'Invasion'

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]

Synonyms of 'invasion'

From: Moby Thesaurus

Words containing 'Invasion'