Source : Webster's Revised Unabridged Dictionary (1913)

Intermediary \In`ter*me"di*a*ry\, a. [Cf. F. interm['e]diaire.]
   Lying, coming, or done, between; intermediate; as, an
   intermediary project.

   {Intermediary amputation} (Surg.), an amputation for injury,
      performed after inflammation has set in.