seismic

adj

Etymology: Based on Ancient Greek σεισμός (seismós, “shaking, earthquake”) + -ic, equivalent to seismo- + -ic.

1. Related to, or caused by an earthquake or other vibration of the Earth.

   “seismic activity”

2. Subject to earthquakes.

   “a seismic area”

3. Of very large or widespread effect.

   “With Spurs having avoided a seismic Cup upset, Newport's heroic display will be rewarded with a lucrative replay at Wembley.”

   “But the most seismic change is the shift to being supportive of open access. In practice, most of the industry has collectively opposed this for the past 25 years. The Department for Transport has been particularly hostile, seeing it as little more than cherry-picking.”