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English definition of “catastrophe”

catastrophe

noun [C] uk   /kəˈtæs.trə.fi/ us  
C2 a sudden event that causes very great trouble or destruction: They were warned of the ecological catastrophe to come. a bad situation: The emigration of scientists is a catastrophe for the country.
catastrophic
adjective uk   /ˌkæt.əˈstrɒf.ɪk/ us    /ˌkæt̬.əˈstrɑː.fɪk/
An unchecked increase in the use of fossil fuels could have catastrophic results for the planet.
(Definition of catastrophe from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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