1. the sudden occurrence of a violent discharge of steam and volcanic material

Definition categories: event, discharge

2. symptom consisting of a breaking out and becoming visible

Definition categories: state, symptom

3. (of volcanos) pouring out fumes or lava (or a deposit so formed)

Similar word(s): eructation, extravasation

Definition categories: state, action, activeness, activity

4. a sudden violent spontaneous occurrence (usually of some undesirable condition)

Similar word(s): irruption, outbreak

Definition categories: event, happening, occurrence, occurrent

5. a sudden very loud noise

Similar word(s): bam, bang, blast, clap

Definition categories: event, noise

6. the emergence of a tooth as it breaks through the gum

Definition categories: event, egress, emergence, issue

Sentences with eruption as a noun:

- There was an eruption of joy at the final whistle.