1
: 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)
2
: of or relating to a vibration on a celestial body (such as the moon) comparable to a seismic event on earth
3
: having a strong or widespread impact : earthshaking
seismic social changes
Examples of seismic in a Sentence
Seismic social changes have occurred.
Recent Examples on the Web
The Duke of Sussex and his wife Meghan Markle took a seismic step back from their royal roles in 2020 and Harry lost his military appointments as the change was made permanent.
—
Janine Henni, People.com, 4 June 2025
Berti, who is the director of the Idaho Geological Survey, told the Idaho Statesman that researchers have been keeping a close eye on the seismic activity, which originated from the Basin Butte area north of Stanley.
—Nicole Blanchard, Idaho Statesman, 3 June 2025
Experts for Denver Water — the project’s manager, the engineer who designed the dam, and a federal official overseeing the project — testified that any lengthy pause in construction would increase the risk that a catastrophic weather or seismic event would overcome the incomplete structure.
—Elise Schmelzer, Denver Post, 30 May 2025
The following are ways to consider this seismic technological shift.
—Tom Dunlop, Forbes.com, 30 May 2025
See All Example Sentences for seismic
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Janine Henni, People.com, 4 June 2025
Berti, who is the director of the Idaho Geological Survey, told the Idaho Statesman that researchers have been keeping a close eye on the seismic activity, which originated from the Basin Butte area north of Stanley.
—Nicole Blanchard, Idaho Statesman, 3 June 2025
Experts for Denver Water — the project’s manager, the engineer who designed the dam, and a federal official overseeing the project — testified that any lengthy pause in construction would increase the risk that a catastrophic weather or seismic event would overcome the incomplete structure.
—Elise Schmelzer, Denver Post, 30 May 2025
The following are ways to consider this seismic technological shift.
—Tom Dunlop, Forbes.com, 30 May 2025
See All Example Sentences for seismic
Cite this Entry
“Seismic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/seismic. Accessed 10 Jun. 2025.
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seismic
adjective
seis·mic
ˈsīz-mik 
ˈsīs-
: of, subject to, or caused by an earthquake or an earth vibration caused by something else (as an explosion)
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