The Collaborative International Dictionary of English v.0.48:

Decimal \Dec"i*mal\, n.
   A number expressed in the scale of tens; specifically, and
   almost exclusively, used as synonymous with a decimal
   fraction.
   [1913 Webster]

   Circulating decimal, or Circulatory decimal, a decimal
      fraction in which the same figure, or set of figures, is
      constantly repeated; as, 0.354354354; -- called also
      recurring decimal, repeating decimal, and repetend.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Circulate \Cir"cu*late\, v. i. [imp. & p. p. Circulated; p.
   pr. & vb. n. Circulating.] [L. circulatus, p. p. of
   circulare, v. t., to surround, make round, circulari, v. i.,
   to gather into a circle. See Circle.]
   [1913 Webster]
   1. To move in a circle or circuitously; to move round and
      return to the same point; as, the blood circulates in the
      body. --Boyle.
      [1913 Webster]

   2. To pass from place to place, from person to person, or
      from hand to hand; to be diffused; as, money circulates; a
      story circulates.
      [1913 Webster]

   Circulating decimal. See Decimal.

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

   Circulating medium. See Medium.
      [1913 Webster]

WordNet (r) 3.0 (2006):

circulating decimal
    n 1: a decimal with a sequence of digits that repeats itself
         indefinitely [syn: circulating decimal, recurring
         decimal, repeating decimal]