The term 'every two weeks' is often used to describe a period of time that occurs every fourteen days. This term can also be referred to as 'fortnightly' (11 letters) or 'BIWEEKLY' (8 letters). Both terms refer to the same concept of a two-week period, but they are used differently in different parts of the world. In the United States, 'BIWEEKLY' is more commonly used, while in the United Kingdom, 'fortnightly' is more common.