eruption

noun

erup·​tion i-ˈrəp-shən 

1

a

: an act, process, or instance of erupting

b

: the breaking out of a rash on the skin or mucous membrane

2

: a product of erupting (such as a skin rash)

Synonyms of eruption

• explosion
• outburst
• burst

Examples of eruption in a Sentence

a great eruption of glee as it suddenly dawned on her that she had won

the eruption of the volcano Krakatoa was one of the most violent in global history

Recent Examples on the Web

But solar flares and coronal mass ejections (CMEs) — huge eruptions of solar plasma — could be a threat to Artemis astronauts venturing far beyond our planet, as could cosmic rays, which originate far beyond our solar system. —Leonard David, Space.com, 30 Mar. 2026

The last eruption of nationwide gatherings in October drew approximately 7 million people, according to their tally. —Arkansas Online, 30 Mar. 2026

Dating the pine trees in the mound indicates that it was constructed around 551 CE, with most of the trees being deposited approximately 15 years after the Dust Veil Event—a volcanic eruption that triggered significant climate change. —Maria Mocerino, Interesting Engineering, 29 Mar. 2026

Vanessa Van Helsing wakes up from a coma to discover that a volcanic eruption has blotted out the sun, letting vampires prey 24/7. —K. Thor Jensen, PC Magazine, 27 Mar. 2026

Word History

First Known Use

1555, in the meaning defined at sense 1a

Phrases Containing eruption

• creeping eruption
• post-eruption

Rhymes for eruption

• corruption
• disruption
• irruption
• incorruption
• interruption

Kids Definition

eruption

noun

erup·​tion i-ˈrəp-shən 

1

: an act, process, or instance of erupting

2

: a product (as a skin rash) of erupting

Medical Definition

eruption

noun

erup·​tion i-ˈrəp-shən 

1

: an act, process, or instance of erupting

the eruption of the tooth from the gum

specifically : the breaking out of an exanthem or enanthem on the skin or mucous membrane (as in measles)

2

: something produced by an act or process of erupting: as

a

: the condition of the skin or mucous membrane caused by erupting

b

: one of the lesions (as a pustule) constituting this condition