MilesianPronunciation: /mʌɪˈliːʃɪən, -ʃ(ə)n/Definition of Milesian noun a native or inhabitant of ancient Miletus. adjective relating to Miletus or its inhabitants. Origin: mid 16th century: via Latin from Greek Milēsios + -anMilesian in other Oxford dictionaries Definition of Milesian in the US English dictionary