the ability to understand or comprehend something fully and perfectly (see Molina)
IPAspelling:
iːʃɑhsikɑːittɑ
Alonso de Molina:
ixacicaitta. nic. (pret. oniquixacicaittac.) comprehender o alcanzar asaber algo entera y perfectamente. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 44v. col. 1. Thanks to Joe Campbell for providing the transcription.