旬
HSK 7-9decade (10 days); period of 10 days (months)
Examples
上旬
First ten days of the month
中旬
Middle ten days of the month
下旬
Last ten days of the month
decade (10 days); period of 10 days (months)
上旬
First ten days of the month
中旬
Middle ten days of the month
下旬
Last ten days of the month