What do you call a period of 2 weeks in English?

There isn't a single, universally recognized word for a period of two weeks in English. However, you can use a few options, depending on the context:

Formal:

* Fortnight: This is the most common and formal term for a period of two weeks. It's often used in legal and historical contexts.

* Biweekly: This refers to something happening every two weeks. You could use it to describe a recurring event.

Informal:

* Two weeks: This is the most straightforward and commonly used option.

* A couple of weeks: This is a more casual way to refer to a period of two weeks.

The best choice depends on the specific situation and your desired level of formality.