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

OpenAI’s conduct could have seismic implications for Silicon Valley. —Alex Heath, The Verge, 14 Dec. 2024

Apple’s Magic Modem Apple’s 2025 will also have another seismic change, and that’s the first 5G modem designed by Apple. —Ewan Spence, Forbes, 13 Dec. 2024

But keeping the building would raise budget challenges because a large portion of the funds used to buy the Gas Company Tower came from money that had been earmarked for seismic retrofits and other necessary fixes to the Hall of Administration and other county buildings. —Roger Vincent, Los Angeles Times, 13 Dec. 2024

If the tour hadn’t already made a seismic impact just via its announcement, the actual performances sent Swift from superstardom to the stratosphere. —Eric Frankenberg, Billboard, 9 Dec. 2024

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)