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Etymology
From and. "Seven" is as in "7 " (see also ) and "7 days of the week". Each of the three "" leaves the body after each of the next 3 years, while each of the seven "po" leaves after every 7 days, which results in a larger memorial offering after 49 days and the ultimate end of mourning after 3 years.

Noun

 * 1)  49 days after someone's death, during which their souls are still wandering or need releasing, and regular food offerings are required