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Latin word annus comes from Proto-Indo-European *h₂étnos, and later Proto-Italic *atnos (Year.)
*h₂étnos (Proto-Indo-European)
*h₂et-no- (Proto-Indo-European)
*h₂et-nos- (Proto-Indo-European)
*atnos (Proto-Italic)
Year.
annus (Latin)
Time; season. Year.