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The Collaborative International Dictionary of English v.0.48 (gcide)

Explosion \Ex*plo"sion\, 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]