tectonic

adjective4

1. •
   Of, relating to, or caused by large-scale movements of the Earth's (or a similar planet's) lithosphere.
2. •
   (figurative) Momentous, utter, vast.

   • But it would be a mistake to imagine that we are benignly coming full circle, or even that we are finding that the old ways are still the most efficient. A tectonic shift has occurred. — 2019
3. •
   Of or relating to construction or to architecture.
4. •
   Structural.