The Collaborative International Dictionary of English v.0.48:

Reiterative \Re*it"er*a*tive\ (r?-?t"?r-?-t?v), n.
   1. (Gram.) A word expressing repeated or reiterated action.
      [1913 Webster]

   2. A word formed from another, or used to form another, by
      repetition; as, dillydally.
      [1913 Webster]

WordNet (r) 3.0 (2006):

reiterative
    adj 1: marked by iteration [syn: iterative, reiterative]