ETYM Latin eruptio, from erumpere, eruptum, to break out; e out + rumpere, to break: cf. French éruption. Related to Rupture.
1. The emergence of a tooth as it breaks through the gum.
2. (Of volcanos) Pouring out fumes or lava; SYN. eructation.

1. A sudden violent spontaneous occurrence of an undesirable condition.
2. A sudden rise in the incidence of a disease; a sudden increase in numbers of a harmful organism and especially an insect within a particular area
3. Insurrection, revolt

1. A sudden violent disturbance; SYN. tumultuous disturbance.
2. A sudden violent happening; SYN. burst, flare-up.