The Collaborative International Dictionary of English v.0.48:

Repetitious \Rep`e*ti"tious\ (-t?sh"?s), a.
   Repeating; containing repetition. [U.S.] --Dr. T. Dwight.
   [1913 Webster]

WordNet (r) 3.0 (2006):

repetitious
    adj 1: characterized by repetition; "repetitive movement" [syn:
           repetitive, repetitious] [ant: nonrepetitive]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "repetitious":
   battological, boring, duplicative, echoic, echoing, imitative,
   iterative, long-winded, parrotlike, pleonastic, prolix,
   recapitulative, redundant, reduplicative, reechoing, reiterant,
   reiterative, repeating, repetitional, repetitionary, repetitive,
   tautological, tautologous, tedious, tiresome, windy, wordy