| n. | 1. | |
| 1. | The act of invading; the act of encroaching upon the rights or possessions of another; encroachment; trespass. | |
| 2. | A warlike or hostile entrance into the possessions or domains of another; the incursion of an army for conquest or plunder. | |
| 3. | The incoming or first attack of anything hurtful or pernicious; |
| Noun | 1. | invasion - the act of invading; the act of an army that invades for conquest or plunder |
| 2. | invasion - any entry into an area not previously occupied; "an invasion of tourists"; "an invasion of locusts" Synonyms: encroachment, intrusion | |
| 3. | invasion - (pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body; "the tumor's invasion of surrounding structures" |
INVASION. The entry of a country by a public enemy, making war.
2. The Constitution of the United States, art. 1, s. 8, gives power to
congress "to provide for calling the militia to execute the laws of the
Union, suppress insurrections, and repel invasions." Vide Insurrection.