This is the 1448th most frequent Korean word.
주간
"주간" means "week" or "daytime."
주간 is used here to refer to the time span of a week, highlighting the temporal context.
이번 주간에는 날씨가 매우 좋습니다.
The weather is very nice this week.
주간 is used as an adjective to describe the magazine's feature article as pertaining to the current week.
잡지의 이번 주간 특집 기사는 스포츠에 관한 것입니다.
This week's feature article in the magazine is about sports.
주간 is used here as an adjective to modify 보고서 (report), indicating its weekly periodic nature.