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tectonic

1 ENTRIES FOUND:
tectonic /tɛkˈtɑːnɪk/ adjective
tectonic
/tɛkˈtɑːnɪk/
adjective
Britannica Dictionary definition of TECTONIC
always used before a noun
geology : of or relating to changes in the structure of the Earth's surface
: having a large and important effect