Source : Webster's Revised Unabridged Dictionary (1913)

   {Circulating decimal}. See {Decimal}.

   {Circulating library}, a library whose books are loaned to
      the public, usually at certain fixed rates.

   {Circulating medium}. See {Medium}.

Source : WordNet®

circulating library
     n : library that provides books for use outside the building
         [syn: {lending library}]