ten-day period of a month
Used mainly in compounds and date expressions dividing a month into roughly three ten-day periods, especially 上旬, 中旬, and 下旬.
The meeting is scheduled to be held in early June.
decade of age; ten-year period in one's life
Rare, old-fashioned or literary use for a ten-year span of age, typically seen in compounds such as 六旬 or 七旬 rather than as a free everyday noun.
Please send the documents by the middle third of the month.
七旬 is an old-fashioned expression referring to one's seventies.
last third of a month; 21st to the last day
middle ten days of a month; 11th to 20th of a month
first third of a month; first ten days of a month
first ten days of a month; early part of a month
ten-day report; bulletin issued every ten days
Sino-Japanese reading じゅん of 旬. The kanji is conventionally associated here with a ten-day cycle or period; the detailed historical derivation is not asserted.