E‐rup″tion (?), n. [L. eruptio, fr. erumpere, eruptum, to break out; e out + rumpere, to break: cf. F. éruption. 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.