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multi-

  1. a combining form meaning “many,” “much,” “multiple,” “many times,” “more than one,” “more than two,” “composed of many like parts,” “in many respects,” used in the formation of compound words: multiply; multivitamin.
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Also especially before a vowel, mult-.

Origin of multi-

Middle English < Latin, combining form of multus much, many
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for multi-

multi-

combining form
  1. many or muchmultiflorous; multimillion
  2. more than onemultiparous; multistorey
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Word Origin for multi-

from Latin multus much, many
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 multi-

before vowels mult-, word-forming element meaning "many, many times, much," from comb. form of Latin multus "much, many," from PIE *ml-to-, from root *mel- "strong, great, numerous" (cf. Latin melior "better," Greek mala "very, very much"). Many words that use it (multinational, etc.) are 20c. coinages.

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Online Etymology Dictionary, © 2010 Douglas Harper

multi- in Medicine

multi-

pref.
  1. Many; much; multiple:multiarticular.
  2. More than one:multiparous.
  3. More than two:multipolar.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

multi- in Science

multi-

  1. A prefix that means “many” or “much,” as in multicellular, having many cells.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.