with affirmation, with certification, or in a certified way (see Molina)
IPAspelling:
tɬɑneltiliːlistikɑ
Alonso de Molina:
tlaneltililiztica. con afirmacion, o afirmadamente. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 128r. col. 1. Thanks to Joe Campbell for providing the transcription.