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 launch is particularly seismic in the UK due to the long-running content pact between Warner Bros/HBO and Sky, which to this point as been the only home of new HBO shows, even leading the launch of pay channel Sky Atlantic.
—
Jesse Whittock, Deadline, 9 Feb. 2026
These mini-seismic events are not considered true earthquakes because there is no movement along faults or tectonic plate boundaries.
—Tammie Souza, CBS News, 7 Feb. 2026
These scraps of seismic data from everyday life are gathered by the nodes’ internal geophones.
—Lauren Steele, The Atlantic, 7 Feb. 2026
The Rangers also don’t think that Gore — a former third-overall draft choice, top-five prospect in baseball and the one-time centerpiece of the San Diego Padres’ acquisition of outfielder Juan Soto — is in any need of a seismic makeover or arsenal overhaul.
—Shawn McFarland, Dallas Morning News, 6 Feb. 2026
See All Example Sentences for seismic
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Jesse Whittock, Deadline, 9 Feb. 2026
These mini-seismic events are not considered true earthquakes because there is no movement along faults or tectonic plate boundaries.
—Tammie Souza, CBS News, 7 Feb. 2026
These scraps of seismic data from everyday life are gathered by the nodes’ internal geophones.
—Lauren Steele, The Atlantic, 7 Feb. 2026
The Rangers also don’t think that Gore — a former third-overall draft choice, top-five prospect in baseball and the one-time centerpiece of the San Diego Padres’ acquisition of outfielder Juan Soto — is in any need of a seismic makeover or arsenal overhaul.
—Shawn McFarland, Dallas Morning News, 6 Feb. 2026
See All Example Sentences for seismic
Cite this Entry
“Seismic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/seismic. Accessed 14 Feb. 2026.
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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