Webster's English Dictionary

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reduplication

re.du.pli.ca.tion \ri-.d(y)u:-pli-'ka--sh*n, .re--\ 
   \ri-'d(y)u:-pli-.ka-t-iv, 're--\ n 1: an act or instance of doubling or 
   reiterating  2a: repetition of a radical element or a part of it occurring 
   usu. at the b eginning of a word and often accompanied by change of the 
   radical vowel 2b1: a word or form produced by reduplication  2b2: the 
   repeated element in such a word or form  3: ANADIPLOSIS  - 
   re.du.pli.ca.tive aj