Definitions

1. noun

A sudden and violent outbreak or intrusion, especially of a natural phenomenon such as a volcanic eruption or a flood.

“The city experienced a massive irruption of rain during the storm.”

2. noun

A sudden and violent invasion or attack, especially by a large number of people.

“The riot was a violent irruption of protesters into the city center.”

3. noun

A sudden and often unexplained appearance or emergence of something.

“The irruption of new ideas in the art world was a major cultural shift.”