Webster's English Dictionary

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reduplicate

re.du.pli.cate \ri-'d(y)u:-pli-.ka-t, 're--\ \-k*t\ vt [LL reduplicatus, 
   pp. of reduplicare, fr. L re- + duplicar]e to double - more at DUPLICATE 1: 
   to make or perform again : COPY  2: to form (a word) by reduplication  - 
   re.du.pli.cate aj