rai /ɹaɪ/ noun3 •A form of music, originating in Oran, Algeria from Bedouin shepherds.Rai arrives in the US, in some ways, as the latest rage to hit the World Music record bins, the result of a new post-modern global marketing strategy. — 1991 •A unit of area used in Thailand that is equal, in modern times, to 1,600 square metres (16 ares, 0.16 hectares, 0.3954 acres). •stone money