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equi-

1.
a combining form meaning “equal,” used in the formation of compound words:
equimolecular.
Origin
Middle English < Latin aequi-, combining form representing aequus equal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for equi-

equi-

combining form
1.
equal or equally: equidistant, equilateral
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
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Word Origin and History for equi-

word-forming element meaning "equal," from Latin aequi-, comb. form of aequus "equal, even" (see equal (adj.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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equi- in Science
equi-  
A prefix that means "equal" or "equally," as in equidistant.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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