Polemic ( //) is contentious rhetoric intended to support a specific position by forthright claims and to undermine the opposing position. Polemics are thus seen in arguments on controversial topics. The practice of such argumentation is called polemics. A person who writes polemics, or speaks polemically, is called a polemicist.  The word derives from Ancient Greek πολεμικός (polemikos) 'warlike, hostile',   from πόλεμος (polemos) 'war'. 
Polemics often concern questions in religion or politics. A polemical style of writing was common in Ancient Greece, as in the writings of the historian Polybius. Polemic again became common in medieval and early modern times. Since then, famous polemicists have included satirist Jonathan Swift; French Enlightenment writer, historian, and philosopher Voltaire; Christian anarchist Leo Tolstoy; socialist philosophers Karl Marx and Friedrich Engels; novelist George Orwell; playwright George Bernard Shaw; communist revolutionary Vladimir Lenin; psycholinguist Noam Chomsky; social critic Christopher Hitchens; existential philosopher Søren Kierkegaard; and Friedrich Nietzsche, author of On the Genealogy of Morality: A Polemic.
To support study of 17th- to 19th-century controversies, a British research project has placed online thousands of polemical pamphlets from that period. 
Discussions of atheism, humanism, and Christianity have remained open to polemic into the 21st century. In 2007 Brian McClinton argued in Humani that anti-religious books such as Richard Dawkins's The God Delusion are part of the polemic tradition.  In 2008 the humanist philosopher A. C. Grayling published a book, Against All Gods: Six Polemics on Religion and an Essay on Kindness. 
In Ancient Greece, writing was characterised by what Geoffrey Lloyd and Nathan Sivin called "strident adversariality" and "rationalistic aggressiveness", summed up by McClinton as polemic.   For example, the ancient historian Polybius practised "quite bitter self-righteous polemic" against some twenty philosophers, orators, and historians. 
Polemical writings were common in medieval and early modern times.  During the Middle Ages, polemic had a religious dimension, as in Jewish texts written to protect and dissuade Jewish communities from converting to other religions.  Medieval Christian writings were also often polemical; for example in their disagreements on Islam  or in the vast corpus aimed at converting the Jews.  Martin Luther's 95 Theses, nailed to the door of the church in Wittenberg, was a polemic launched against the Catholic Church.  [note 1] Robert Carliell's 1619 defence of the new Church of England and diatribe against the Roman Catholic Church – Britaine's glorie, or An allegoricall dreame with the exposition thereof: containing The Heathens infidelitie in religion... – took the form of a 250-line poem. 
In the 20th century, George Orwell's Animal Farm was a polemic against totalitarianism, in particular of Stalinism in the Soviet Union. According to McClinton, other prominent polemicists of the same century include such diverse figures as Herbert Marcuse, Noam Chomsky, John Pilger, and Michael Moore. 
- The story of Luther nailing his Theses to the church door has been doubted. See references in Martin Luther#Start of the Reformation - "the story of the posting on the door...has little foundation in truth."
- "polemic" (s.v.). Merriam-Webster Online Dictionary. Springfield, MA: Merriam-Webster. 2005.
- American College Dictionary. New York: Random House.
- Henry George Liddell; Robert Scott. "πόλεμος". A Greek-English Lexicon. on Perseus.
- polemic, or polemical literature, or polemics (rhetoric). britannica.com. Archived from the original on 11 April 2008. Retrieved 21 February 2008.
- "Pamphlet and polemic: Pamphlets as a guide to the controversies of the 17th-19th centuries". St Andrews University Library. Retrieved 15 January 2015.
- McClinton, Brian (July 2007). "A Defence of Polemics" (PDF). Humani (105): 12–13. Archived from the original (PDF) on 22 March 2016.
- Grayling, A. C. (2008). Against All Gods: Six Polemics on Religion and an Essay on Kindness. Oberon Books. ISBN 978-1-840-02728-0.
- Lloyd, Geoffrey; Sivin, Nathan (2002). The Way and the Word: Science and Medicine in Early China and Greece. Yale University Press. ISBN 978-0-300-10160-7.
- Walbank, F. W. (1962). "Polemic in Polybius". The Journal of Roman Studies. 52 (Parts 1 and 2): 1–12. doi: 10.2307/297872. JSTOR 297872.
- Suerbaum, Almut; Southcombe, George (2016). Polemic: Language as Violence in Medieval and Early Modern Discourse. Taylor & Francis. ISBN 978-1-317-07929-3.
- Chazan, Robert (2004). Fashioning Jewish identity in medieval western Christendom. Cambridge University Press. p. 7.
- Tolan, John Victor (2000). Medieval Christian perceptions of Islam. Routledge. p. 420.
- Philippe Bobichon, "Littérature de controverse entre judaïsme et christianisme: Description du corpus et réflexions méthodologiques (IIe-XVIe siècle ») (textes grecs, latins et hébreux), Revue d’Histoire ecclésiastique 107/1, 2012, pp. 5-48; Philippe Bobichon, "Is Violence intrinsic to religious confrontation? The case of Judeo-Christian controversy, second to seventeenth century" in S. Chandra (dir.), Violence and Non-violence across Times. History, Religion and Culture, Routledge, 2018, pp. 33-52.
- Sidney Lee, "Carleill, Robert (fl. 1619)", rev. Reavley Gair (Oxford, UK: OUP, 2004) Retrieved 27 May 2017. Pay-walled.
- Paulin, Tom (26 March 1995). "The Art of Criticism: 12 Polemic". The Independent. Retrieved 6 November 2016.
- Gallop, Jane (2004). Polemic: Critical or Uncritical (1 ed.). New York: Routledge. ISBN 0-415-97228-0.
- Hawthorn, Jeremy (1987). Propaganda, Persuasion and Polemic. Hodder Arnold. ISBN 0-7131-6497-2.
- Lander, Jesse M. (2006). Inventing Polemic: Religion, Print, and Literary Culture in Early Modern England. Cambridge University Press. ISBN 0-521-83854-1.
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