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Invasion (Noun)

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

Nouns denoting natural events.

Microscopic examination revealed the invasion of cancer cells into the lymph nodes, indicating an advanced stage of the disease.
The rapid invasion of bacterial pathogens into the patient's bloodstream led to sepsis and required immediate antibiotic treatment.
Tissue samples from the biopsy showed evidence of tumor cell invasion into the surrounding tissues, necessitating aggressive treatment.
The spread of the virus resulted in the invasion of neural tissues, causing inflammation and damage to the brain.
Histopathological analysis confirmed the invasion of fungal pathogens into the deeper layers of the skin, leading to a severe case of dermatophytosis.

Any entry into an area not previously occupied; "an invasion of tourists"; "an invasion of locusts".

Nouns denoting natural events.

The seasonal invasion of weeds in the garden made maintenance a challenge.
An invasion of rodents in the city's sewer system posed a significant risk to public health.
The annual migration of monarch butterflies can sometimes be seen as an invasion of colorful insects.
A severe invasion of Asian longhorned beetles has been devastating to local tree populations.
In the summer, the small town experienced an invasion of visitors drawn to its beautiful beaches.

The act of invading; the act of an army that invades for conquest or plunder.

Nouns denoting acts or actions.

The Roman Empire successfully repelled the barbarian invasion of their territories in 378 AD.
The Japanese invasion of Pearl Harbor in 1941 led to the United States entering World War II.
When the Allies landed on the beaches of Normandy, they knew they were in for a tough fight following the German invasion.
Many believed that Hitler's invasion of Poland in 1939 marked the beginning of World War II.
Napoleon's failed invasion of Russia in 1812 was a turning point in the French emperor's fortunes.