Ipse Dixit Definition

Origin of Ipse Dixit

• From Latin ipse (“himself”) dīxit (“he said”), third-person singular perfect active of dīcō (“say, speak”), meaning "he himself said it", 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.

  From Wiktionary

• From Latin ipse dīxit he himself said (it) ipse he himself dīxit third person sing. perfect tense of dīcere to say

  From American Heritage Dictionary of the English Language, 5th Edition