IjoPronunciation: /ˈiːdʒəʊ/ (also Ijaw)Definition of Ijo noun (plural same or Ijos) 1a member of a people inhabiting the Niger delta in southern Nigeria. 2 [mass noun] the language of the Ijo, an isolated member of the Niger-Congo family with several highly distinct dialects. adjective relating to the Ijo or their language.