Latin ratiōnālis

→ English irrational (mention)

→ Catalan racional (derived)

→ Danish irrationel (affix)

→ French rationnel (mention)

→ Italian razionale (derived)

→ Latvian racionāls (borrowed)

→ Latvian iracionāls (mention)

→ Dutch rationeel (derived)

→ Polish racjonalny (borrowed)

→ Ukrainian раціональний (borrowed)