Definition of “seismic” - English Dictionary

“seismic” in British English

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seismicadjective

uk /ˈsaɪz.mɪk/ us /ˈsaɪz.mɪk/
seismically
adverb /ˈsaɪz.mɪ.kəl.i/ /ˈsaɪz.mɪ.kəl.i/

Japan is one of the world's most seismically active areas.
It was a war that seismically changed the course of history.

(Definition of “seismic” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“seismic” in American English

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seismicadjective [ not gradable ]

us /ˈsɑɪz·mɪk/

earth science relating to, or caused by an earthquake (= sudden violent movement of the earth’s surface)

(Definition of “seismic” from the Cambridge Academic Content Dictionary © Cambridge University Press)