Meaning of eruption

e•rup•tion

1. an issuing forth suddenly and violently; outburst; outbreak.
2. the ejection of molten rock, steam, etc., as from a volcano or geyser.
3. something that is erupted or ejected, as molten rock, volcanic ash, or steam.
1. the breaking out of a rash or the like.
2. a rash or exanthem.