A fortnight equals 14 days or two full weeks. This term comes from the Old English word fēowertēne niht, meaning "fourteen nights." It’s commonly used in British English, less so in American English. However, its simplicity and clarity make it a useful unit of time. Though rarely used in the U.S., many global regions still say "fortnight" for scheduling. You'll hear it in UK workplaces, TV schedules, and news reports.