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inter-

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  1. a prefix occurring in loanwords from Latin, where it meant “between,” “among,” “in the midst of,” “mutually,” “reciprocally,” “together,” “during” (intercept; interest); on this model, used in the formation of compound words (intercom; interdepartmental).
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Origin of inter-

Middle English < Latin (in some words replacing Middle English entre- < Middle French < Latin inter-), combining form of inter (preposition and adv.); see interior
Can be confusedinter- intra-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for inter-

inter-

prefix
  1. between or amonginternational
  2. together, mutually, or reciprocallyinterdependent; interchange
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Word Origin

from Latin
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 inter-

Latin inter (prep., adv.) "among, between, betwixt, in the midst of," from PIE *enter "between, among" (cf. Sanskrit antar, Old Persian antar "among, between," Greek entera (plural) "intestines," Old Irish eter, Old Welsh ithr "among, between," Gothic undar, Old English under "under"), a comparative of *en "in" (see in). Also in certain Latin phrases in English, such as inter alia "among other things." A living prefix in English from 15c. Spelled entre- in French, most words borrowed into English in that form were re-spelled 16c. to conform with Latin except entertain, enterprise.

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Online Etymology Dictionary, © 2010 Douglas Harper
inter- in Medicine

inter-

pref.
  1. Between; among:interdental.
  2. In the midst of; within:interoceptor.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
inter- in Science

inter-

  1. A prefix meaning “between” or “among,” as in interplanetary, located between planets.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.