ə̇ˈrəpshən, ēˈ- noun
( -s )
Etymology: Middle English erupcioun, from Latin eruption-, eruptio, from eruptus + -ion-, -io -ion
1. : an act, process, or instance of erupting
the volcano was in eruption
the eruption of the tooth from the gum
: outburst
his loud angry eruptions
: outbreak
the eruption of hostilities
the eruption of an epidemic
: rash
an eruption of shopping centers has broken out on the countryside — Weare Holbrook
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. : material erupted by a volcano
b. : the condition of the skin or mucous membrane caused by erupting
c. : one of the lesions (as a pustule) constituting this condition
3. : irruption d
• erup·tion·al -shən ə l, -shnəl adjective