Principal English Translation: 

a son or daughter of people of noble heritage, of a great lineage (see Molina); a person of noble lineage (Sahagún)

Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 10 -- The People, No. 14, Part 11, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 21, 49.

Alonso de Molina: 

tetlapanca. hijo, o hija de personas nobles y de gran linaje.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 111r. col. 2. Thanks to Joe Campbell for providing the transcription.