Two weeks is a commonly used phrase that refers to a period of 14 days. However, there are several synonyms for this phrase that can be used interchangeably. One popular synonym is fortnight, which is derived from the Old English word 'feorwertyne niht' meaning 'fourteen nights.' Another synonym is biweekly, which can be used to describe something that occurs every two weeks. In addition, the phrase '14-day period' can also be used as a synonym for two weeks. Other synonyms include 'a couple of weeks,' 'a span of two weeks,' or 'two calendar weeks.' Regardless of which synonym you choose, each of these phrases refers to the same length of time - 14 days.