of or pertaining to building or construction; constructive; architectural.
pertaining to the structure of the earth's crust.
referring to the forces or conditions within the earth that cause movements of the crust.
designating the results of such movements: tectonic valleys.

1650–60; < Late Latin tectonicus < Greek tektonikós pertaining to construction, equivalent to tekton- (stem of téktōn) carpenter + -ikos -ic

tectonically, adverb
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World English Dictionary
tectonic (tɛkˈtɒnɪk)
1.  denoting or relating to construction or building
2.  geology
 a.  (of landforms, rock masses, etc) resulting from distortion of the earth's crust due to forces within it
 b.  (of processes, movements, etc) occurring within the earth's crust and causing structural deformation
[C17: from Late Latin tectonicus, from Greek tektonikos belonging to carpentry, from tektōn a builder]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1650s, "of or relating to building," from L.L. tectonicus, from Gk. tektonikos "pertaining to building," from tekton (gen. tektonos) "builder, carpenter," from PIE base *tek- "to make" (see texture). The geological sense is recorded from 1894.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
tectonic   (těk-tŏn'ĭk)  Pronunciation Key 
Relating to the forces involved in plate tectonics or the structural features resulting from them.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Port-au-Prince sits near the border of two tectonic plates.
Most volcanoes form at the junctions of tectonic plates.
Many of the world's largest earthquakes take place at subduction zones where
  tectonic plates collide, forcing one under the other.
Set atop a tectonic hotspot, the small island is home to breathtaking eruptions
  and other geologic sites.
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