The space of fourteen days; two weeks.

a period of fourteen consecutive days; "most major tennis tournaments last a fortnight"

fourteen days; two weeks. Example

A period of 14 days; two weeks.

The time elasped between the new and full moons. Half a synodic month of 14.765,294 days. See synodical month.

n. 1. Two weeks.

A fortnight is a unit of time equal to two weeks: that is 14 days, or literally 14 nights. The term is common in the British Isles and many Commonwealth countries, but rarely used in the United States. It derives from the Old English feowertiene niht, meaning "fourteen nights".