Definition - The separation of a compound word into its parts.

Example -
Writing nevertheless as never the less.

Etymology -
In Greek diacope means "cutting through" (from the Greek diakopto, to cut in two or cut through).

Oxford English Dictionary -
The first citation for the word is from 1586:
"Tmesis or Diacope, a division of a word compound into two parts, as, What might be so ever … for, whatsoever might be, &c."
(A. Day Eng. Secretary ii. (1625) 83)

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