Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An unsupported assertion, usually by a person of standing; a dictum.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • An unproved proposition that is accepted solely on the authority of someone who is known to have asserted it; a dogmatic statement; a dictum.
  • An authority who makes such an assertion.

from The Century Dictionary and Cyclopedia

  • n. An assertion without proof; a dogmatic expression of opinion; a dictum.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an unsupported dogmatic assertion

Etymologies

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, Fourth Edition)
From Latin ipse ("himself") dīxit ("he said"), third-person singular perfect active of dīcō ("say, speak"), a calque of Ancient Greek αὐτός (autos) ἔφα (epha). Originally used by the followers of Pythagoreanism, who claimed this or that proposition to be uttered by Pythagoras himself. (Wiktionary)

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