seis·​mic ˈsīz-mik How to pronounce seismic (audio)
: of, subject to, or caused by an earthquake
also : of or relating to an earth vibration caused by something else (such as an explosion or the impact of a meteorite)
: of or relating to a vibration on a celestial body (such as the moon) comparable to a seismic event on earth
: having a strong or widespread impact : earthshaking
seismic social changes
seismically adverb

Examples of seismic in a Sentence

Seismic social changes have occurred.
Recent Examples on the Web That’s the predicament facing Elliott (Maisy Stella) who, while tripping on ‘shrooms on a camping trip with friends, gets visited by her cynical older self (Aubrey Plaza), a presence that foreshadows seismic emotional shifts. Randy Myers, The Mercury News, 18 June 2024 The ancient rocky outcrops along the highway are susceptible to crumbling landslides, and even minor seismic activity can send large boulders crashing onto the roadway below. Shaun Goodwin, Idaho Statesman, 14 June 2024 Her recent concerts at Edinburgh, Scotland, led to seismic activity being detected four miles from the stadium where the singer was performing, according to the British Geological Society. Amarachi Orie, CNN, 14 June 2024 After creating seismic activity at Taylor Swift concerts in California and Washington last year, Swifties have done it again — this time in Edinburgh. Nancy Tartaglione, Deadline, 13 June 2024 See all Example Sentences for seismic 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'seismic.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Greek seismos shock, earthquake, from seiein to shake; probably akin to Avestan thwaēshō fear

First Known Use

1858, in the meaning defined at sense 1

Time Traveler
The first known use of seismic was in 1858

Dictionary Entries Near seismic

Cite this Entry

“Seismic.” Dictionary, Merriam-Webster, Accessed 25 Jun. 2024.

Kids Definition


seis·​mic ˈsīz-mik How to pronounce seismic (audio)
: of, subject to, or caused by an earthquake or an earth vibration caused by something else (as an explosion)

More from Merriam-Webster on seismic

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