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
This represents a seismic behavioral shift: consumers are predominantly shopping accessible brands on resale platforms.
—
Kristen Classi-Zummo, Forbes.com, 23 July 2025
The Android Earthquake Alerts (AEA) system, which was developed by engineers at Google and the University of California-Berkeley, uses the phones’ sensors to detect seismic activity and deliver early-warning alerts to users before dangerous shaking begins.
—Doyle Rice, USA Today, 19 July 2025
The system leveraged the accelerometers inside these devices to gather seismic data, combine it to detect patterns consistent with an earthquake, and deliver timely alerts to people who might be affected.
—Abhimanyu Ghoshal, New Atlas, 18 July 2025
With seismic streamlining of minor league baseball in 2020, the long term goal is to make baseball more like basketball and football, where the college game serves as the primary development vehicle.
—Dom Amore, Hartford Courant, 13 July 2025
See All Example Sentences for seismic
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Kristen Classi-Zummo, Forbes.com, 23 July 2025
The Android Earthquake Alerts (AEA) system, which was developed by engineers at Google and the University of California-Berkeley, uses the phones’ sensors to detect seismic activity and deliver early-warning alerts to users before dangerous shaking begins.
—Doyle Rice, USA Today, 19 July 2025
The system leveraged the accelerometers inside these devices to gather seismic data, combine it to detect patterns consistent with an earthquake, and deliver timely alerts to people who might be affected.
—Abhimanyu Ghoshal, New Atlas, 18 July 2025
With seismic streamlining of minor league baseball in 2020, the long term goal is to make baseball more like basketball and football, where the college game serves as the primary development vehicle.
—Dom Amore, Hartford Courant, 13 July 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 29 Jul. 2025.
Copy CitationKids Definition
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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