The deliberate repetition of a word or phrase at the end of successive clauses or sentences.
One example is from the Gettysburg Address: "...government of the people, by the people, for the people...".
It is a literary and rhetorical device, used to provide emphasis; the cadence of the repetition helps focus the mind on the differences.
Etymology: Greek epistrophe, a turning about.
'Anaphora' is the same thing, but at the beginning of successive clauses or sentences.
The Gettysburg Address provides an example of this as well: "...we cannot dedicate, we cannot consecrate, we cannot hallow this ground."
(Etymology for anaphora: Greek anapherein, to bring back.)