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Latin word munus comes from Proto-Indo-European *moy-nós and ultimately Proto-Indo-European *mey- (change, swap)
*mey- (Proto-Indo-European)
change, swap
*moy-nós, (Proto-Indo-European)
munus (Latin)
A burden, duty, obligation. A gift. A service, favor. A service, office, employment. A spectacle, public show.