inter-

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).
Origin
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 confused
inter-, intra-.
British Dictionary definitions for inter-

inter-

prefix
1.
between or among: international
2.
together, mutually, or reciprocally: interdependent, interchange
Word Origin
from Latin
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.

inter- in Medicine

inter- pref.

  1. Between; among: interdental.

  2. In the midst of; within: interoceptor.

inter- in Science
inter-  
A prefix meaning "between" or "among," as in interplanetary, located between planets.