Definition of reduplication
1
: an act or instance of doubling or reiterating
2a
: an often grammatically functional repetition of a radical element or a part of it occurring usually at the beginning of a word and often accompanied by change of the radical vowel
b(1)
: a word or form produced by reduplication
(2)
: the repeated element in such a word or form
3
: anadiplosis
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Merriam-Webster unabridged
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Time Traveler for reduplication
The first known use of reduplication was in 1555
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