weeks
n. countable A1 Beginner US //ˈwiks// UK //wˈiːks// weeks
n. a period of seven days in a row. You use this to talk about time, usually starting on Monday and ending on Sunday.
n. a period of seven consecutive days, typically beginning on a Monday or Sunday depending on the regional calendar.
I am going on vacation for two weeks.
The project deadline is in three weeks, so we need to start working on the final report today.
The study tracked the participants' sleep patterns over several weeks to ensure the data reflected their natural habits rather than a temporary change in routine.
Usage
Often used with 'in' to indicate a future time or 'for' to indicate duration.