GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Explosion , n. [L. explosio a driving off by clapping: cf. F. explosion explosion. See Explode.]
   The act of exploding; detonation; a chemical action which causes the sudden formation of a great volume of expanded gas; as, the explosion of gunpowder, of fire damp, etc.
   1913 Webster
   A bursting with violence and loud noise, because of internal pressure; as, the explosion of a gun, a bomb, a steam boiler, etc.
   1913 Webster
   A violent outburst of feeling, manifested by excited language, action, etc.; as, an explosion of wrath.
   1913 Webster
   A formidable explosion of high-church fanaticism.
   Macaulay.
   
   1913 Webster
   a sudden and substantial increase; a rapid acceleration; as, the population explosion.
   PJC