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reduplicate (v.)

"to double again, multiply, repeat," 1560s, from Medieval Latin reduplicatus, past participle of reduplicare "to redouble," from re- "back, again" (see re-) + Latin duplicare "to double" (see duplicate (adj.)). In philology, "to repeat or double, as a syllable or the initial part of a syllable (usually a root syllable)," by 1832. Related: Reduplicated; reduplicating; reduplicative; reduplicature.

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Definitions of reduplicate from WordNet

reduplicate (v.)
form by reduplication;
The consonant reduplicates after a short vowel
The morpheme can be reduplicated to emphasize the meaning of the word
Synonyms: geminate
reduplicate (v.)
make or do or perform again;
Synonyms: duplicate / double / repeat / replicate
From wordnet.princeton.edu