Meaning and Usage
"星期" primarily means "week" and is used to refer to the seven-day cycle. It is also commonly combined with numbers to indicate specific days of the week, such as "星期一" (Monday) or "星期天" (Sunday).
Common Collocations
When using "星期" with numbers, note that "星期天" and "星期日" both mean Sunday, with "星期天" being more colloquial. This word is very common in daily conversation and scheduling contexts.