Proto-Indo-European *h₂et-no-

→ English biennium (derived)

→ Catalan any (derived)

→ Corsican annu (inherited)

→ Spanish año (derived)

→ French an (derived)

→ Italian anno (derived)

→ Proto-Italic anno (derived(itc-pro/osp))

→ Latin annus (derived)

→ Romanian an (derived)