GNU Collaborative International Dictionary of English

Found one definition 

  1.       

    Explosion , n. [L. explosio a driving off by clapping: cf. F. explosion explosion. See Explode.]
    1.  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
    2. 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
    3. 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
    4. a sudden and substantial increase; a rapid acceleration; as, the population explosion.
      PJC