tecpillatolli.

Headword: 
tecpillatolli.
Principal English Translation: 

elegant and polite speech or thinking (see Molina)

IPAspelling: 
teːkpillɑhtoːlli
Alonso de Molina: 

tecpillatolli. habla, o razonamiento cortes y elegante.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 93v. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

tecpillatolli = the language of the nobility
Katarzyna Mikulska Dabrowska, "'Secret Language' in Oral and Graphic Form: Religious-Magic Discourse in Actec Speeches and Manuscripts," Oral Tradition 25:3 (2010), 325–363, see page 327.