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equi-

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

Middle English < Latin aequi-, combining form representing aequus equal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for equi-

equi-

combining form
  1. equal or equallyequidistant; equilateral
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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

Word Origin and History for equi-

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

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Online Etymology Dictionary, © 2010 Douglas Harper

equi- in Science

equi-

  1. A prefix that means “equal” or “equally,” as in equidistant.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.