Definitions:

1. a sudden great increase noun
   • the population explosion
2. a sudden outburst noun
   • an explosion of laughter
3. the act of exploding or bursting noun
   • the explosion of the firecrackers awoke the children
4. the noise caused by an explosion noun
   • the explosion was heard a mile away

Synonyms:

• blowup
• burst
• detonation
• plosion