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Dictionary definition for: Invasion

1. (n) the act of invading; the act of an army that invades for conquest or plunder

2. (n) any entry into an area not previously occupied; "an invasion of tourists" "an invasion of locusts"

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

WordNet 2.1 Copyright Princeton University. All rights reserved.