a tithe or something that is tithed (see Molina)
matlatlactepan omaan. el diezmo, o cosa dezmada. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 53v. col. 1. Thanks to Joe Campbell for providing the transcription.