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 agency is closely monitoring seismic activity to assess whether more eruptions are likely in the coming days.
—
Gordon G. Chang, MSNBC Newsweek, 8 Apr. 2025
The woolly mouse, to a minor extent, and the dire wolves, to a scientifically seismic one, are first steps in that direction.
—Jeffrey Kluger, Time, 7 Apr. 2025
The shift from Mary Mary to solo artist was seismic, but Erica took it in stride.
—Shelby Stewart, Essence, 2 Apr. 2025
Though the plant’s physical address is in what has traditionally been rural Bryan County, the seismic impact of its $7.59 billion investment is rippling out across neighboring counties and spreading across the entire state.
—Jim Zahner, USA Today, 1 Apr. 2025
See All Example Sentences for seismic
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Gordon G. Chang, MSNBC Newsweek, 8 Apr. 2025
The woolly mouse, to a minor extent, and the dire wolves, to a scientifically seismic one, are first steps in that direction.
—Jeffrey Kluger, Time, 7 Apr. 2025
The shift from Mary Mary to solo artist was seismic, but Erica took it in stride.
—Shelby Stewart, Essence, 2 Apr. 2025
Though the plant’s physical address is in what has traditionally been rural Bryan County, the seismic impact of its $7.59 billion investment is rippling out across neighboring counties and spreading across the entire state.
—Jim Zahner, USA Today, 1 Apr. 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 16 Apr. 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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