Webster's Revised Unabridged Dictionary · 1913

Reduplication

Reduplication (-k?sh?n) , noun

[Compare French réduplication, Latin reduplicatio repetition.]

1.
The act of doubling, or the state of being doubled.
2.
(Prosody) A figure in which the first word of a verse is the same as the last word of the preceding verse.
3.
(Philology) The doubling of a stem or syllable (more or less modified), with the effect of changing the time expressed, intensifying the meaning, or making the word more imitative; also, the syllable thus added; as, L. tetuli; poposci.