Caspian /ˈkæspi.ən/noun 2adjective 1forms 1 noun2 •A person from a country that borders the Caspian Sea. •(historical) A member of the ancient people dwelling along the southern and southwestern shores of the Caspian Sea, in the region which was called Caspiane after them. adjective1 •Of or pertaining to the Caspian Sea or the region around it. formsCaspians