Source : Webster's Revised Unabridged Dictionary (1913)

Inter- \In"ter-\ [L. inter, prep., among, between, a compar.
   form of in in; akin to intra, intro, within, Skr. antar
   between, in, and E. in. See {In}, and cf. {Entrails},
   {Interior}, {Enter-}, {Exterior}.]
   A prefix signifying among, between, amid; as, interact,
   interarticular, intermit.