Seismic Definition

sīzmĭk
adjective
Of, having to do with, or caused by an earthquake or earthquakes or by man-made earth tremors.
Webster's New World
Subject to earthquakes.
Webster's New World
Earthshaking.
An issue of seismic proportions and ramifications.
American Heritage

(figuratively) Of very large, or widespread effect.

Wiktionary
Synonyms:
seismal

Origin of Seismic

  • Based on Ancient Greek σεισμός (seismos, “shaking, earthquake") + -ic.

    From Wiktionary

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