seismic Definition in the Cambridge English Dictionary
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Definition of “seismic” - English Dictionary

Definition of "seismic" - American English Dictionary

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seismicadjective [not gradable]

 us   /ˈsɑɪz·mɪk/
earth science relating to, or caused by an earthquake (= ​suddenviolentmovement of the earth’s ​surface)
(Definition of seismic from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "seismic" - British English Dictionary

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seismicadjective

uk   us   /ˈsaɪz.mɪk/
[before noun] specialized geology relating to or ​caused by an earthquake: seismic ​activity/​waves having very ​great and ​damagingeffects: The ​news that the ​chairman would ​resign set off seismic ​waves in the ​businesscommunity.
(Definition of seismic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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