ipse dixit

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ip·se dix·it

 (ĭp′sē dĭk′sĭt)
An unsupported assertion, usually by a person of standing; a dictum.

[From Latin ipse dīxit, he himself said (it) : ipse, he himself + dīxit, third person sing. perfect tense of dīcere, to say.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ipse dixit

(ˈɪpseɪ ˈdɪksɪt)
(Literary & Literary Critical Terms) an arbitrary and unsupported assertion
[C16, literally: he himself said it]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ip•se dix•it

(ˈɪp si ˈdɪk sɪt)

an assertion without proof.
[1565–75; < Latin: he himself said it, translation of Greek autòs épha a phrase attributed to the Pythagoreans, in citing Pythagoras' authority]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

ipse dixit

A Latin phrase meaning he himself said it, used to mean an unsupported assertion.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ipse dixit - an unsupported dogmatic assertion
assertion, asseveration, averment - a declaration that is made emphatically (as if no supporting evidence were necessary)
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
To avoid, therefore, all imputation of laying down a rule for posterity, founded only on the authority of ipse dixit --for which, to say the truth, we have not the profoundest veneration--we shall here waive the privilege above contended for, and proceed to lay before the reader the reasons which have induced us to intersperse these several digressive essays in the course of this work.
He does not discount or reject all of Staudenmaier's thought, but distinguishes painstakingly what is responsible theologizing for a thinker of his time from the incoherences and ipse dixits produced by his fear and loathing of specified adverse forces.
In a product liability action in federal court, where Daubert standards apply, a plaintiff's expert's opinion evidence grounded on the expert's ipse dixit or bare assertion does not cut the ice, the Seventh Circuit ruled in Clark v.