tectonic

Concise Oxford English Dictionary © 2008 Oxford University Press:
tectonic /tɛkˈtɒnɪk/

▶adjective

• 1 Geology relating to the structure of the earth's crust and the large-scale processes which take place within it.

• 2 relating to building or construction.

• 3 (of a change or development) very significant or considerable): a tectonic shift in public attitudes.

– derivatives
tectonically adverb.

– origin C17: via late L. from Gk tektonikos, from tektōn ‘carpenter, builder’.