1 : the sudden, loud, and violent release of energy that happens when something (such as a bomb) breaks apart in a way that sends parts flying outward
The filmmakers staged the car's explosion.
The island was rocked by a series of volcanic explosions.
set off an explosion
2 a : a sudden and very fast increase
The region has experienced a population explosion.
an explosion of interest
2 b : a sudden expression of some strong emotion
an explosion of anger
2 c : a sudden occurrence of laughter
His comments prompted an explosion of laughter from the crowd.