Definition: eruption

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Source: WordNet (r) 1.7 

eruption
     n 1: the sudden occurrence of a violent discharge of steam and
          volcanic material [syn: volcanic eruption]
     2: symptom consisting of a breaking out and becoming visible
     3: (of volcanos) pouring out fumes or lava [syn: eructation]
     4: a sudden very loud noise [syn: bang, blowup, clap, blast,
         loud noise]
     5: the emergence of a tooth as it breaks through the gum

Source: Webster's Revised Unabridged Dictionary (1913) 

Eruption \E*rup"tion\, n. [L. eruptio, fr. erumpere, eruptum, to
   break out; e out + rumpere, to break: cf. F. ['e]ruption. See
   Rupture.]
   1. The act of breaking out or bursting forth; as:
      (a) A violent throwing out of flames, lava, etc., as from
          a volcano of a fissure in the earth's crust.
      (b) A sudden and overwhelming hostile movement of armed
          men from one country to another. --Milton.
      (c) A violent commotion.

                All Paris was quiet . . . to gather fresh
                strength for the next day's eruption. --W.
                                                  Irving.

   2. That which bursts forth.

   3. A violent exclamation; ejaculation.

            He would . . . break out into bitter and passionate
            eruditions.                           --Sir H.
                                                  Wotton.

   4. (Med.) The breaking out of pimples, or an efflorescence,
      as in measles, scarlatina, etc.