neyollotilo.

Headword: 
neyollotilo.
Principal English Translation: 

something that is committed to memory (see Molina); something that is worthy of being remembered, that ought to be guarded in memory (see yollotia) (Simeón)

Orthographic Variants: 
neiollotilo
Alonso de Molina: 

neyollotilo. cosa que se encomienda a la memoria.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 66r. col. 2. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

ontentli in pialonj, in neiollotilonj, in concauhtiaque = two words worthy of being guarded, worthy of being remembered, which they left as they went (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 6 -- Rhetoric and Moral Philosophy, No. 14, Part 7, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 91.

mjiec in moteneoa in neiollotilonj, cenca qualli in tlatolli in juh tlatoa cioa, ioan cenca quâqualli in metaphoras = Much is mentioned which is memorable - very good discourses of the sort which women say; and very good are each of the metaphors (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 6 -- Rhetoric and Moral Philosophy, No. 14, Part 7, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 151.