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Latin word iustus comes from Proto-Indo-European *h₂ey-, and later Proto-Indo-European *h₂óyu (Long time, lifetime.)
*h₂ey- (Proto-Indo-European)
*h₂óyu (Proto-Indo-European)
Long time, lifetime.
*h₂yew- (Proto-Indo-European)
*h₂yew-es-tos (Proto-Indo-European)
*jowos (Proto-Italic)
Law. Oath.
*jowestos (Proto-Italic)
Just, lawful.
iustus (Latin)
(figurative) exact, straight, direct. Just, righteous. Justified, merited, well-deserved, due. Lawful, legal.