CimmerianPronunciation: /sɪˈmɪərɪən/Definition of Cimmerian noun 1a member of an ancient nomadic people who overran Asia Minor in the 7th century bc. 2 Greek Mythology a member of a mythical people living in perpetual mist and darkness near the land of the dead. adjective relating to the Cimmerians. Origin:via Latin from Greek Kimmerios + -anCimmerian in other Oxford dictionaries Definition of Cimmerian in the US English dictionary