Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Proto-Slavic *serdьnъ

→ Belarusian сярэдні (inherited)
→ Bulgarian среден (inherited)
→ Czech střední (inherited)
→ Macedonian среден (inherited)
→ Polish średni (inherited)
→ Russian средний (derived)
→ Russian середний (derived)
→ Slovak stredný (inherited)
→ Ukrainian середній (inherited)