What is "repetend"

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

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.

n. 1 A refrain (having repeated words, sounds or phrases) 2 (context mathematics English) A repeating decimal