Noun

(en noun)

A violent release of energy (sometimes mechanical, nuclear, or chemical.)

* {{quote-magazine, date=2013-06-21, author= Chico Harlan

, volume=189, issue=2, page=30, magazine=(The Guardian Weekly) , title= Japan pockets the subsidy … , passage=Across Japan, technology companies and private investors are racing to install devices that until recently they had little interest in: solar panels. Massive solar parks are popping up as part of a rapid build-up that one developer likened to an "explosion ."}}

A bursting due to pressure.

The sound of an explosion.

A sudden uncontrolled increase.

*

As with the Lejeuneaceae, this pattern of massive speciation appears to be correlated with the Cretaceous explosion of the angiosperms and the simultaneous creation of a host of new microenvironments, differing in humidity, light intensity, texture, etc.

A sudden outburst.

* {{quote-magazine, date=2013-08-10, volume=408, issue=8848, magazine=(The Economist)

, title= Can China clean up fast enough? , passage=All this has led to an explosion of protest across China, including among a middle class that has discovered nimbyism. That worries the government, which fears that environmental activism could become the foundation for more general political opposition. It is therefore dealing with pollution in two ways—suppression and mitigation.}}

Noun

(en noun)

The sudden flowing of a large amount of something.

* 2013 June 18, , " Protests Widen as Brazilians Chide Leaders," New York Times (retrieved 21 June 2013):

The protests rank among the largest outpourings of dissent since the nation’s military dictatorship ended in 1985.

* 2012 , August 1. Owen Gibson in Guardian Unlimited, London 2012: rowers Glover and Stanning win Team GB's first gold medal

Great Britain has collected its first gold medal of the London Games after Heather Stanning and Helen Glover won the coxless pairs with a stunning performance that will spark a mass outpouring of celebration and relief across the country.