ipse dixit

Latin.

he himself said it.

an assertion without proof.

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World English Dictionary

ipse dixit (ˈɪpseɪ ˈdɪksɪt)

—n
	an arbitrary and unsupported assertion

[C16, literally: he himself said it]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Ipse dixit is always a great word to know.

So is flibbertigibbet. Does it mean:

a chattering or flighty, light-headed person.

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

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Etymonline

Word Origin & History

ipse dixit

1477, from L., lit. "he (the master) said it," translation of Gk. autos epha, phrase used by disciples of Pythagoras when quoting their master.

Matching Quote

"All great things bring about their own destruction through an act of self-overcoming: thus the law of life will have it, the law of the necessity of "self-overcoming" in the nature of life—the lawgiver himself eventually receives the call: "patere legem, quam ipse tulisti." In this way Christianity as a dogma was destroyed by its own morality; in the same way Christianity as morality must now perish, too: we stand on the threshold of this event. After Christian truthfulness has drawn one inference after another, it must end by drawing its most striking inference, its inference against itself; this will happen, however, when it poses the question "what is the meaning of all will to truth?""

-Friedrich Nietzsche

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ipse dixit

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