Saturday (see Molina); literally, the seventh day in a week
(partly a loanword from Spanish, semana, week)
Alonso de Molina:
icchicumilhuitl incentetl semana. el sabado. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 32r. col. 1. Thanks to Joe Campbell for providing the transcription.