Definition of eruption in US English:



  • 1An act or instance of erupting.

    ‘the eruption of Vesuvius’
    ‘magma is stored in crustal reservoirs before eruption’
    • ‘Most earthquakes and volcanic eruptions do not strike randomly but occur in specific areas, such as along plate boundaries.’
    • ‘This record has been obscured on the Earth by billions of years of rain, wind, erosion, volcanic eruptions, mountain building, and plate tectonics.’
    • ‘The June 1991 Mount Pinatubo eruption produced voluminous pyroclastic flows and a major Plinian umbrella cloud during its paroxysmal phase.’
    • ‘It is true that we often cannot do much to stop natural disasters like volcanic eruptions or earthquakes.’
    • ‘A sudden eruption or collapse of one of these volcanoes would have catastrophic effects, but current research is not just about assessing risk.’
    • ‘Pet lovers are upset to see the trauma caused to animals by noise and sudden eruptions of fireworks.’
    • ‘Natural hazards such as volcanic eruptions, earthquakes, and mudflows present a significant risk to the population of the surrounding area.’
    • ‘Lava flows and smaller eruptions continued for decades.’
    • ‘The vesicular nature of the products is typical of plinian eruptions in the Taupo Volcanic Zone, with rapid bubble formation and degassing occurring during eruption.’
    • ‘Andesitic rocks produced by dome-forming eruptions dominate the geology.’
    • ‘The eruption was so sudden and completely unexpected that there was little chance to flee.’
    • ‘The procession slowly makes its way down through poor weather and further volcanic eruptions and earthquakes, hoping that a key bridge spanning a deep gorge on the route will still be standing.’
    • ‘Others, called volcanic earthquakes, are usually shallower and can be precursors to volcanic eruptions and intrusions of magma.’
    • ‘These eruptions deposited pebble-grade volcaniclastic breccias of an intermediate composition within a few kilometres of the Rio Tinto Anticline.’
    • ‘Geochemical analyses of these clasts show that the eruption tapped two chemically distinct rhyolitic magmas.’
    • ‘Most of Mars' surface was shaped later by meteorite impacts, volcanic eruptions and erosion by dust and wind.’
    • ‘Sornette's discussion of the science of earthquakes, volcanic eruptions, hurricanes, tornadoes and meteorite impacts is riveting.’
    • ‘In the natural world, volcanic eruptions can cause gravity flows.’
    • ‘Some volcanic eruptions generate dangerous lahars (mud flows of volcanic ash mixed with water) that travel far beyond the volcano.’
    • ‘The vast majority of earthquakes and volcanic eruptions occur near plate boundaries, but there are some exceptions.’
    discharge, venting, ejection, emission, explosion
    View synonyms
    1. 1.1 A sudden outbreak of something, typically something unwelcome or noisy.
      ‘a sudden eruption of street violence’
      • ‘And I think one of our common themes is the eruption of an unprecedented violence in the heart of the air-conditioned, sterile world of America.’
      • ‘Many other instances of alleged inaccuracy, distortion and misrepresentation have remained on file and I may well have ignored them but for the sudden eruption of complaints in recent months.’
      • ‘A sudden eruption in the manager of common sense on tactical deployment, a rediscovery of cohesive drive among the players, and England could yet bid convincingly for glory in the summer.’
      • ‘The sudden eruption of tension between them, she couldn't understand.’
      • ‘This was followed by a sudden eruption of angry male voices, what sounded like the phone being dropped into a schooner of beer, and then a disconnection.’
      • ‘The sudden eruption of gunfire was so thunderous that the very air seemed to vibrate.’
      • ‘He stumbled back, stunned by both my appearance and the sudden eruption of pain.’
      • ‘There was a sudden eruption of pleading voices taking up the correction of the English language, all very carefully using ‘may’, until at last the consent came.’
      • ‘All of a sudden an eruption of movement rocks the ground!’
      • ‘Above all, however, ageing was described as a dynamic process, not a sudden eruption but a progressive deterioration.’
      • ‘The sudden eruption of voices downstairs impeded any attempt Sammy started.’
      • ‘Seen in this context, the sudden eruption of the Global Justice Movement in 1999, becomes explicable.’
      • ‘All of a sudden, I was overcome by a violent eruption of giggling.’
      • ‘The eruption of street violence also made clear to foreign investors that Indonesia was unsafe and that political interests remain on top of economic ones.’
      • ‘Questions might well be asked about the sudden eruption of a long simmering dispute immediately after the general election.’
      • ‘You can be sensitive to the objections, try to understand why the sudden eruption of gay marriage has caused such offence, while arguing your case.’
      • ‘This process of the formation of new groups of workers, socialist agitation, and then sudden eruptions of struggle continued into the 20th century.’
      • ‘The polarisation of politics creates strains between the social democratic leaders and their mass base through sudden political eruptions.’
      • ‘After ten minutes there was a sudden eruption of amity, and handshakes all around.’
      • ‘We could not play outside and had to barricade ourselves indoors as there could be a sudden eruption of war.’
      outbreak, flare-up, upsurge, outburst, epidemic, breakout, sudden appearance, start, rash, wave, spate, flood, explosion, burst, blaze, flurry
      View synonyms
    2. 1.2 A spot, rash, or other prominent and reddish mark appearing suddenly on the skin.
      • ‘This is beneficial when a diabetic develops itchy skin, rashes or hot skin eruptions.’
      • ‘The most commonly observed side effects are nervousness, sleeplessness, skin eruptions, euphoria, leg or ankle swelling, dizziness, and diarrhea.’
      • ‘A 35 year old Afro-Caribbean man attending our department with lichen planus of the trunk was noted to have a pustular scalp eruption with scarring alopecia.’
      • ‘Three weeks later, the eruption recurred, and a skin biopsy showed features of a lichenoid drug reaction.’
      • ‘Previous trials of oral cephalosporins had not improved the skin eruptions.’
      • ‘Application of topical steroids to the face may induce an acneform eruption resembling the pustular form of rosacea.’
      • ‘Here, the skin reacts abnormally to sunlight, leading to itching, redness and, in its severe form, a variety of skin eruptions such as blisters and rashes.’
      • ‘Place it directly on skin eruptions and boils - the swelling will be reduced and any poisons drawn out.’
      • ‘"Allergies triggered by weather conditions including running nose, itchy eyes and skin eruptions and rashes are now common throughout the year.’
      • ‘Because skin is among the organs where HIV disease and immunosuppression typically manifest, accurate diagnosis of skin eruptions is critical.’
      • ‘When several members of the same household experience pruritic eruptions, scabies should be considered.’
      • ‘She suffers from an extreme form of hemangioma, which causes a spongy eruption of the skin.’
      • ‘If your moisturizing lotion or cream is giving you a rash or causing skin eruptions, lanolin could be the culprit.’
      • ‘Symptoms were characterized by hypertension coupled with nervousness, sleeplessness, skin eruptions, and morning diarrhea in 14 patients.’
      • ‘A common cause of allergies, rashes, skin eruptions and more serious autoimmune problems is leaky gut syndrome.’
      • ‘Just a few weeks later, she broke out with shingles, an agonizing ailment where the nerves become infected and large blister-like eruptions explode all over the skin.’
      • ‘Logically, a blister is an abnormal eruption of the skin that eventually goes away.’
      • ‘Three days earlier he had received cryotherapy for a florid eruption of viral warts over his right hand.’
      • ‘Skin eruptions resembling eczema are reported regularly.’
      • ‘Molluscum contagiosum and warts are benign epidermal eruptions that result from viral infections of the skin.’
      rash, outbreak, inflammation
      View synonyms


Late Middle English: from Old French, or from Latin eruptio(n-), from the verb erumpere (see erupt).