1) Double 2) Duplicate 3) Form by reduplication 4) Geminate 5) Make or do or perform again 6) Repeat 7) Replicate 1) Geminate 
• (a.) Double; doubled; reduplicative; repeated. • (a.) Valvate with the margins curved outwardly; -- said of the /stivation of certain flowers. • (v. t.) To repeat the first letter or letters of (a word). See Reduplication, 3. • (v. t.) To redouble; to multiply; to repeat.
Re·du'pli·cate adjective [ Prefix re- + duplicate : confer Latin reduplicatus . Confer Redouble .] 1. Double; doubled; reduplicative; repeated. 2. (Botany) Valvate with the margins curved outwardly; -- said of the ...stivation of certain flowers. 
[v] - form by reduplication, as of sounds or morphemes of a word
verb form by reduplication; `The consonant reduplicates after a short vowel`; `The morpheme can be reduplicated to emphasize the meaning of the word`