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British English 1 min read Published January 2025 10 learners asked about this

What does "fortnight" mean?

What it means: Two weeks, or fourteen nights. "I'll be away for a fortnight" = I'll be away for two weeks. "A fortnight ago" = two weeks ago.Where it comes from: Old English "feowertyne niht" - fourteen nights.

What it means

Two weeks, or fourteen nights. "I'll be away for a fortnight" = I'll be away for two weeks. "A fortnight ago" = two weeks ago.

Where it comes from

Old English "feowertyne niht" - fourteen nights. Medieval time was often measured in nights rather than days. The word survived in British English; American English dropped it.

Why Americans don't use it

No particular reason - the word simply fell out of use in American English. Americans say "two weeks" where British speakers might say "a fortnight."

Common uses

  • "In a fortnight's time" = in two weeks
  • "A fortnightly meeting" = every two weeks
  • "Once a fortnight" = every two weeks

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Standard British English - not informal, not formal, just neutral. Used comfortably in professional and casual contexts.

Frequently asked

What does "fortnight" mean?

Two weeks, or fourteen nights. "I'll be away for a fortnight" = I'll be away for two weeks. "A fortnight ago" = two weeks ago.

Is "fortnight" formal or informal?

Standard British English - not informal, not formal, just neutral. Used comfortably in professional and casual contexts.

Why do native speakers say "fortnight"?

Old English "feowertyne niht" - fourteen nights. Medieval time was often measured in nights rather than days. The word survived in British English; American English dropped it.

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