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.]

ipse dixit

(ˈɪpseɪ ˈdɪksɪt)
(Literary & Literary Critical Terms) an arbitrary and unsupported assertion
[C16, literally: he himself said it]

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]

ipse dixit

A Latin phrase meaning he himself said it, used to mean an unsupported assertion.
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)
References in periodicals archive ?
The prosecution department moved the petition through Additional Prosecutor General Abdul Samad, saying that Mudassir was killed in a fake encounter and ipse dixit of Riaz Abbas, Station House Officer of Kasur's Sadar Police Station, was false.
For all of his anecdotes, Frank's claim that it is rests on nothing more than his ipse dixit.
It is, no doubt, scandalous when the judiciary goes outside of the Constitution to strike down laws based on penumbras, the mystery of life, personal preference, or as the late-Justice Antonin Scalia would say, plain old ipse dixit.
Perhaps the best-written Madison book of all, Drew McCoy's The Last of the Fathers: James Madison and the Republican Legacy, applied this same mode of argument--a Madisonian ipse dixit is to be accepted without question--in lieu of proof regarding the chief point at issue therein: that Madison, in retirement, correctly contrasted the Virginia and Kentucky Resolutions of 1798 and 1799 and Virginia Report of 1800 to the South Carolina Nullifiers' argument of 1832-33.
A Constitution Bench by a majority of 3:2 held that "in the absence of the relevant material, much less due verification, the report of the Governor has to be treated as the personal ipse dixit (perception or opinion) of the Governor.
Finally, this book encourages scholars to keep revising Renaissance Aristotelianism as a rigid tradition blindly subjected to Aristotle's ipse dixit.