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invasion

in·va·sion [ in váy'n ] (plural in·va·sions)


noun 
Definition:
 
1. attempt to conquer: a hostile entry by an armed force into a country's territory, especially with the intention of conquering it

2. arrival in large numbers: the arrival of large numbers of people or things at one time
an invasion of tourists

3. spoiling: a spoiling of something by interfering with it or taking some of it away

4. spread of something harmful: the arrival or spread of something that causes damage or harm

5. medicine spread of disease: the spread of disease-causing organisms or malignant cells in the body

6. botany aggressive spread of plant: the aggressive spread of a plant species in an area, stifling the growth of preexisting species

[15th century. Directly or via French< late Latin invasion-< Latin invas-, past participle of invadere (see invade)]
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