Definition - Emphasizing a word by repeating it.

Example -
I'm a mad mad mad mad dad.

Etymology -
The word derives from the Greek plekein, to plait.

Oxford English Dictionary -
Its first citation is from 1586:
"Ploche, when by an Emphasis, a word is either in praise or disgrace reiterated or repeated."
(A. Day Eng. Secretary ii. (1625) 86 )

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