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

1375–1425; late Middle English < Latin ēruptiōn- (stem of ēruptiō). See erupt, -ion

eruptional, adjective
noneruption, noun
preeruption, noun
reeruption, noun

eruption, irruption. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1555, from L. eruptionem (nom. eruptio) "a breaking out," from stem of erumpere "break out, burst forth," from ex- "out" + rumpere "to break, rupture" (see rupture).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

eruption e·rup·tion (ĭ-rŭp'shən)

  1. An appearance of a rash or blemish on the skin.

  2. Such a rash or blemish.

  3. The emergence of a tooth through the gums.

e·rup'tive (-tĭv) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
eruption   (ĭ-rŭp'shən)  Pronunciation Key 
The release of gas, ash, molten materials, or hot water into the atmosphere or onto the Earth's surface from a volcano or other opening in the Earth's surface.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for eruptions
After several devastating eruptions of taal volcano, the old taal town site was buried.
Volcanic eruptions and metamorphism release gases into the atmosphere.
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