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a combining form meaning “thrice,” used in the formation of compound words:
Origin of ter-
< Latin, combining form of ter; akin to trēs three Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for ter-


combining form
three, third, or three times: tercentenary
Word Origin
from Latin ter thrice; related to trēsthree
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for ter-

word-forming element meaning "thrice, three times," from Latin ter "thrice," from *tris-, from root of three. Cf. Latin tertius "third."

Online Etymology Dictionary, © 2010 Douglas Harper
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