- The beginning or incursion of a disease.
- Local spread of a malignant neoplasm by infiltration or destruction of adjacent tissue; for epithelial neoplasms, invasion signifies infiltration beneath the epithelial basement membrane.
- Entrance of foreign cells into a tissue, such as polymorphonuclear leukocytes in inflammation.
[L. invasio, fr. in-vado, pp. -vasus, to go into, attack]
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