Definition - The use of similarly structured elements that have more or less the same length.

Example -
I came, I saw, I conquered.
(But not I came, I saw: ice cream.)

Etymology -
The word derives from the Greek isos, equal + kolon, member.

Oxford English Dictionary -
Its first citation is from 1550:
"Isocolon. Compar, euen or equall, is when the oracion hath in it the partes of the whyche we spake before (Articulus, Dialyton), and that they be made of euen number of sillables: but thys equalitie must not stand by numbryng of them, but by perceyuyng of it in the mynd."
(R. Sherry Treat. Schemes & Tropes sig. D5)

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