Principal English Translation:
to think, ponder, reflect (see Molina)
Alonso de Molina:
yolnonotza. no. vel. nino. (pret. onoyolnonotz. vel. oninoyolnonotz.) tratar, o consultar algo consigo mismo.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 41r. col. 1. Thanks to Joe Campbell for providing the transcription.
Attestations from sources in English:
Ma xicnemilican, yhuan má ypan ximoyolnonotzacan çenca huey neihmatiliztica = Consider and ponder on it with very great prudence
Andrés Sáenz de la Peña, Manual de los Santo Sacramentos, 1643, f. 33r.; translation by Mark Z. Christensen, "Nahua and Maya Catholicisms: Ecclesiastical Texts and Local Religion in Colonial Central Mexico and Yucatan," Ph.D. Dissertation, Pennsylvania State University, 2010, Appendix E, 12.
Attestations from sources in Spanish:
neyolnonotzaya = lo que se ha pensado, meditado, compuesto, minuta, borrador
neyolnonotzaliztli = meditación, reflexión
neyolnonotzalli = juicio, reflexión, meditación
ipan neyolnotzalli = considerado, apreciado, juzgado
neyolnonotzaloni = motivo, sujeto de meditación
Rémi Siméon, Diccionario de la lengua náhuatl o mexicana (Mexico: Siglo XXI, 1996), 317.