Webster's Revised Unabridged Dictionary · 1913

Reduplicate

Reduplicate (r?*d?"pl?*k?t) , adjective

[Prefix re- + duplicate: compare Latin reduplicatus. Compare Redouble.]

1.
Double; doubled; reduplicative; repeated.
2.
(Botany) Valvate with the margins curved outwardly; -- said of the estivation of certain flowers.

Reduplicate (-k?t) , transitive verb

[Compare Late Latin reduplicare.]

1.
To redouble; to multiply; to repeat.
2.
(Grammar) To repeat the first letter or letters of (a word). See Reduplication, 3.