Source : Webster's Revised Unabridged Dictionary (1913)

Interjacence \In`ter*ja"cence\, Interjacency \In`ter*ja"cen*cy\,
   n. [See {Interjacent}.]
   The state of being between; a coming or lying between or
   among; intervention; also, that which lies between.

         England and Scotland is divided only by the
         interjacency of the Tweed.               --Sir M. Hale.