Etymology
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tectonic (adj.)

1650s, "of or relating to building or construction," from Late Latin tectonicus, from Greek tektonikos "pertaining to building," from tekton (genitive tektonos) "builder, carpenter, woodworker; master in any art (sculpture, metal-work, writing)," from PIE root *teks- "to weave," also "to fabricate." The geological sense, "pertaining to the structure of the Earth's crust," is recorded from 1887.

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Definitions of tectonic

tectonic (adj.)
pertaining to the structure or movement of the earth's crust;
tectonic valleys
tectonic plates
tectonic (adj.)
of or pertaining to construction or architecture;
Synonyms: architectonic
From wordnet.princeton.edu