Definition of tectonic adjective from the Oxford Advanced Learner's Dictionary

 

tectonic

 adjective
adjective
BrE BrE//tekˈtɒnɪk//
 
; NAmE NAmE//tekˈtɑːnɪk//
 
[only before noun](geology)
 
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connected with the structure of the earth’s surface see also plate tectonics Word Origin mid 17th cent. (originally relating to building or construction): via late Latin from Greek tektonikos, from tektōn ‘carpenter, builder’.
See the Oxford Advanced American Dictionary entry: tectonic