seismic
adj. C1 Advanced US //ˈsaɪzmɪk// UK //sˈaɪzmɪk// seis·mic
adj. relating to earthquakes or strong shaking. You also use it to describe a change that is huge and affects many people.
adj. relating to earthquakes or the vibration of the earth. Used figuratively to describe a change or event of great magnitude and impact.
The news caused a seismic shift in public opinion.
The invention of the internet created a seismic change in how we communicate.
Historians often cite the fall of the Berlin Wall as a seismic event that reshaped the political landscape of Europe and the world.
Based on Ancient Greek σεισμός (seismós, “shaking, earthquake”) + -ic, equivalent to seismo- + -ic.