noun (used with a singular verb)
the science or art of assembling, shaping, or ornamenting materials in construction; the constructive arts in general.
Origin of tectonics
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
noun (functioning as singular)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper
The branch of geology that deals with the broad structural and deformational features of the outer part of the Earth, their origins, and the relationships between them. See more at plate tectonics.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.