an act or instance of exploding; a violent expansion or bursting with noise, as of gunpowder or a boiler ( opposed to implosion ).

the noise itself

The loud explosion woke them.

a violent outburst, as of laughter or anger.

a sudden, rapid, or great increase

a population explosion.

the burning of the mixture of fuel and air in an internal-combustion engine.

Phonetics . plosion.

noun

implosion

noun

access , backfire , bang , blast , blowout , blowup , burst , clap , combustion , concussion , crack , detonation , firing , fit , flare-up , fulmination , gust , ignition , outbreak , outburst , paroxysm , percussion , pop , report , roar , salvo , bark , rat-a-tat-tat , snap , eruption , bomb , bursting , detonization , discharge