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Polyptoton // is the stylistic scheme in which words derived from the same root are repeated (such as "strong" and "strength"). A related stylistic device is antanaclasis, in which the same word is repeated, but each time with a different sense. Another related term is figura etymologica.
In inflected languages polyptoton is the same word being repeated but appearing each time in a different case. (for example, "Iuppiter," "Iovis," "Iovi," "Iovem," "Iove" [in Latin being the nominative, genitive, dative, accusative, and ablative forms of Iuppiter, respectively]).
The form is relatively common in Latin Christian poetry and prose in a construction called the superlative genitive, in phrases such as sanctum sanctorum ("holy of holies"), and found its way into languages such as Old English, which naturally favored the alliteration that is part and parcel of polyptoton—in fact, polyptoton is "much more prevalent in Old English verse than in Latin verse." The specific superlative genitive in Old English, however, occurs only in Latinate Christian poems, not in secular poetry.
[T]hough deserted by the un-English government of England, they asserted their own ancient character...— G.K. Chesterton, speech in the trial of Jean Fertier (1803)
Judge not, that ye be not judged— Matthew 7:1
An alternative way to utilize the stylistic device is to develop polyptoton over the course of an entire novel, which is done in Mary Shelley's Frankenstein. Shelley combines polyptoton with periphrastic naming, which is the technique of referring to someone using several indirect names. The creature in Frankenstein is referred to by many names, such as "fiend", "devil", "being", and "ogre". However, the first name that Shelley uses in reference to the creature is "wretch". Throughout the novel, various forms of the term are used, such as "wretchedly" and "wretchedness", which is indicative of polyptoton. According to Duyfhuizen, the gradual development of polyptoton in Frankenstein is significant because it symbolizes the intricacies of one's own identity. 
- "The Greeks are strong, and skillful to their strength, Fierce to their skill, and to their fierceness valiant;" William Shakespeare, Troilus and Cressida I, i, 7-8
- "With eager feeding food doth choke the feeder." William Shakespeare Richard II II,i,37
- "Not as a call to battle, though embattled we are." John F. Kennedy, Inaugural Address, January 20, 1961.
- "Thou art of blood, joy not to make things bleed." Sir Philip Sidney
- "Absolute power corrupts absolutely." Lord Acton
- "Who shall watch the watchmen themselves (Quis custodiet ipsos custodes?)?" Juvenal
- "Diamond me no diamonds, prize me no prizes..." Alfred, Lord Tennyson, Lancelot and Elaine
- Fleming, Damian (2012). "Rex regum et cyninga cyning: 'Speaking Hebrew' in Cynewulf's Elene". In Michael Fox, Manish Sharma. Old English Literature and the Old Testament. Toronto: U of Toronto P. pp. 229–52. ISBN 9780802098542.
- (Farnsworth 2011, p. 72).
- (Farnsworth 2011, p. 63).
- Duyfhuizen, Bernard. "Periphrastic Naming In Mary Shelley's Frankenstein." Studies In The Novel 27.4 (1995): 477.Academic Search Premier. Web. 15 Feb. 2014.