Gua·ra·ni / gwärəˈnē/ • n. (pl. same) 1. a member of an American Indian people of Paraguay and adjacent regions.2. the language of this people, one of the main divisions of the Tupi-Guarani language family and a national language of Paraguay.3. (gua·ra·ni) the basic monetary unit of Paraguay, equal to 100 centimos.• adj. of or relating to the Guarani or their language.