Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Latin reor
← Old Church Slavonic радити (cognate)
← Ancient Greek ἀριθμός (cognate)
← Proto-Indo-European *h₂reh₁- (root)
← Proto-Indo-European *h₂reh₁- (derived)
← Proto-Indo-European *h₂er- (mention)
← Proto-Italic *rēōr (inherited)
← Ossetian рад (cognate)
← Sanskrit राध्नोति (cognate)
← Old Irish rad (cognate)
← Albanian radhë (cognate)

→ English rate (mention)
→ English reason (mention)
→ English ratiocination (mention)
→ Old English riman (cognate)
→ Czech racionální (derived)
→ Danish rationel (affix)
→ Danish irrationel (affix)
→ Danish ræson (affix)
→ Icelandic -ræður (mention)
→ Italian rata (mention)
→ Italian rato (mention)
→ Latin ratio (affix)
→ Latin rens (mention)
→ Latin irritus (cognate)
→ Latin ratus (mention)
→ Latin ratihabeo (mention)
→ Latin raturus (mention)
→ Latin rator (mention)
→ Lithuanian rodyti (cognate)
→ Romanian arăta (mention)