aunt, great aunt, sister of one's grandfather or grandmother (see Molina)
Alonso de Molina:
teci. tia, hermana de ahuelo, o de ahuela. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 92v. col. 1. Thanks to Joe Campbell for providing the transcription.