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Latin word beatus comes from Proto-Indo-European *deh₂-, and later Proto-Italic *dweos (Happy.)
*deh₂- (Proto-Indo-European)
*dwejos (Proto-Italic)
*dweos (Proto-Italic)
Happy.
beo (Latin)
I bless. I enrich (with). I gladden.
beatus (Latin)
(Medieval Latin, Ecclesiastical Latin) blessed. (substantive) happy or fortunate person. Copious, sumptuous. Happy, fortunate. Prosperous, wealthy.