tectonic
Tectonic (adj) means relating to the large-scale structure and movement of the Earth's crust. Example: “The earthquake was caused by tectonic plate movement.”
How to use tectonic
Learner’s notesIn plain EnglishUsually refers to the movement of the Earth's crust, or figuratively to a huge, sweeping change.
Fill the gap
Can you complete this real example?
The earthquake was caused by _____ plate movement.
Etymology
From Greek tektonikos ("pertaining to building"), from tekton ("builder, carpenter"). Its geological sense dates from the 1890s.