seismic

adjective

seis·​mic ˈsīz-mik 

ˈsīs-

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

seismically

ˈsīz-mi-k(ə-)lē 

adverb

Examples of seismic in a Sentence

Seismic social changes have occurred.

Recent Examples on the Web

Halabura said the spring 3D seismic survey has boosted confidence ahead of the commercial validation drilling program at Lawson. — Georgina Jedikovska, Interesting Engineering, 13 July 2026

That seismic news meant that Banijay and All3 production and sales competitor ITV Studios (ITVS) will soon become an independent player and potential takeover target, as it is not included in the purchase. — Jesse Whittock, Deadline, 10 July 2026

From year to year, local seismic activity varies greatly, Bauer said. — Tess Kenny, Chicago Tribune, 10 July 2026

Using seismic and acoustic listening devices and dogs, the teams searched with teams from Venezuela, Chile, Costa Rica, El Salvador and Mexico, alongside local Venezuelans, to locate victims trapped alive under the rubble. — Ella Moore july 9, Miami Herald, 9 July 2026

Word History

Etymology

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

Phrases Containing seismic

• seismic shift

Kids 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)