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equi-

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equi-

a combining form meaning “equal,” used in the formation of compound words: equimolecular.

Origin:
ME < L aequi-, comb. form repr. aequus equal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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equi-  
pref.  Equal; equally: equiangular.

[Middle English, from Latin aequi-, from aequus, equal.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

equi- 
comb. form of L. æquus "equal, even." Equidistant and equilateral both first attested 1570; equipoise is 1635, replacing phrase equal poise.
Online Etymology Dictionary, © 2001 Douglas Harper
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