Fortnight is a common term used in the United Kingdom and some other countries to refer to a period of two weeks. However, many alternatives to fortnight also exist in different parts of the world. For instance, the term "biweekly" is frequently used in the US to mean an event that occurs twice a week but can also mean a period of two weeks. "Sennight" is a term used to describe a week's period, which is now largely obsolete. Other synonyms include "half-month," "14 days," or "two weeks." These terms can be useful in avoiding confusion and making communication more effective across various regions and cultures.