Definition of "Aztec"

The lords of Tlatelolco were greatly angered over this and said, one to another, "These Aztecs believe that we are of an alien lineage. Do they not know that we are Aztecs like them[?](= los señores de Tlatelulco, recibieron mucho enojo y pesadumbre, y dixeron entre sí mesmos: estos mexicanos imaginan que nosotros somos de diferente generacion quellos; no saben que somo mexicanos)

1994, Diego Durán, translated by Doris Heyden, The History of the Indies of New Spain

Although united culturally, the Aztecs thought of themselves in terms of their particular tribal affiliations: as Mexica, Tetzcoca, Culhua, Tepaneca, etc.

1989, Elizabeth Hill Boone, Incarnations of the Aztec Supernatural: The Image of Huitzilopochtli in Mexico and Europe