necoctitlantli.

Headword: 
necoctitlantli.
Principal English Translation: 

a messenger who goes between two people; or, an ambassador (see Molina)

Alonso de Molina: 

necoctitlantli. mensajero entre dos, o embaxador.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 65r. col. 1. Thanks to Joe Campbell for providing the transcription.