A fortnight is fourteen nights, or two weeks. This word isn't used much in American English, but you'll come across it if you travel to England — or read a lot of old British novels.

The word fortnight is still in use in Great Britain and some former British colonies. It comes from the Old English, and is literally a shortened form of fourteen nights. People sometimes use it when they're discussing their vacations or their pay schedules. In the United States, however, people typically just say "two weeks."

Definitions of fortnight

n a period of fourteen consecutive days

“most major tennis tournaments last a fortnight
two weeks
Type of:
period, period of time, time period
an amount of time

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