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.

Guaraní Native South American tribe and language. The tribe's population has decreased greatly, although most Paraguayans descend from Guaraní, and their language survives as Paraguay's second national language.