adjective/raθjoˈnal/
rational; reasonable
Synonyms: razonable
Etymology tree Proto-Indo-European *h₂er- Proto-Indo-European *-éh₁ti Proto-Indo-European *h₂reh₁- Proto-Italic *rēōr Latin reor Latin ratus Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin ratiō Proto-Indo-European *h₂el-der.? Proto-Italic *-ālis Latin -ālis Latin rationālisbor. Spanish racional Borrowed from Latin rationālis.