Nounten-day period (in a month) · ten-year period (in one's age); decade

Nounlast third of a month; 21st to the last day of a month

Adverb (fukushi), Nounfirst 10 days of the month

Nounfirst third of a month; first ten days of a month

Nounmiddle ten days of a month; 11th to 20th day of a month