Proto-Slavic *tretь

→ Belarusian трэці (inherited)

→ Bulgarian трети (inherited)

→ Czech třetí (inherited)

→ Upper Sorbian třeći (inherited)

→ Polish trzeci (inherited)

→ Romanian treti (borrowed)

→ Russian третий (inherited)

→ Slovak tretí (inherited)

→ Silesian trzeci (inherited)

→ Ukrainian третій (inherited)