ipse dixit

[ ip-se -dik-sit; English ip-see -dik-sit ]
/ ˈɪp sɛ ˈdɪk sɪt; English ˈɪp si ˈdɪk sɪt /

noun

an assertion without proof.

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Origin of ipse dixit

<Latin: he himself said it
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for ipse dixit

ipse dixit
/ Latin (ˈɪpseɪ ˈdɪksɪt) /

noun

an arbitrary and unsupported assertion

Word Origin for ipse dixit

C16, literally: he himself said it
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012