ipsedixitism

From Latin ipse dīxit (“he himself said it”, used in the Middle Ages in reference to Aristotle) +‎ -ism. Coined in the late 18th century by Jeremy Bentham.

• (UK) IPA^(key): /ˌɪpsiːˈdɪksɪtɪzəm/

• Audio (Southern England):

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• (US) IPA^(key): /ˌɪpsiˈdɪksɪtɪzəm/

• Audio (General American):

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ipsedixitism (countable and uncountable, plural ipsedixitisms)

1. (countable) An unfounded, false and dogmatic assertion; an ipse dixit.
2. (uncountable) The practice of making such assertions.