ic omilhuitl semana

Etymology
From.

Noun

 * 1) Monday; the second day of the week.

Usage notes

 * It should be noted that the seven-day week was adopted by the Aztecs only after the Spanish conquest. Prior to Spanish arrival the Aztecs used two calendrical systems: the, divided into 20 , or periods of 13 days, for a total of 260 days; and the , divided into 18 periods of 20 days each, plus another 5 unlucky days, for a total of 365 days.