to comprehend and understand something entirely (see Molina)
Alonso de Molina:
macicacaqui. nitla. (pret. onitlamacicacac.) comprehender y entender algo enteramente. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 50v. col. 2. Thanks to Joe Campbell for providing the transcription.