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Latin word pondus comes from Proto-Indo-European *(s)pen-
*(s)pen- (Proto-Indo-European)
to pull, stretch, spin
*pondos (Proto-Italic)
pondus (Latin)
(of character) firmness, constancy. Consequence, importance. Heaviness, weight of a body. Load, burden. Quantity, number, multitude. Weight. Weight of a pound.