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Latin word pecunia comes from Proto-Indo-European *peḱ-, and later Proto-Indo-European *péḱu (Livestock.)
*peḱ- (Proto-Indo-European)
*péḱu (Proto-Indo-European)
Livestock.
*peku- (Proto-Indo-European)
pecu (Latin)
Cattle. Domestic animals.
pecunia (Latin)
(figuratively) cash, ready money, liquid wealth. Money. Wealth.