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A fortnight is a unit of time equal to 14 days (2 weeks). The word derives from the Template:Lang-ang, meaning "fourteen nights". Fortnight and fortnightly are commonly used words in the English-speaking world, where some wages, salaries, and social security benefits are paid on a fortnightly basis, except North America, where its use is rare outside some Canadian regions and insular traditional communities (e.g., Amish) in the United States. American and Canadian payroll systems may use the term biweekly in reference to pay periods every two weeks. Neither term should be confused with semimonthly (in one year there are 26 fortnightly or biweekly versus 24 semimonthly pay periods).

Astronomy

For more information see eclipse cycle.

In astronomy, a fortnight is half a synodic month, the mean time between a full moon and a new moon (and vice versa). This is equal to 14.77 days. In the Hindu calendar this period is called a Paksha (also Paksa) and consists of 15 Tithi.

In other languages

In many languages, there is no single word for a two-week period and the equivalent terms "two weeks", "14 days", or (counting inclusively) "15 days" have to be used.

• Celtic languages: in Welsh, the term pythefnos, meaning "15 nights", is used instead. This is in keeping with the Welsh term for a week, which is wythnos ("eight nights"). In Irish, the term is coicís.

• Similarly, in Greek, the term δεκαπενθήμερο (dekapenthímero), meaning "15 days", is also used.

• The Hindu calendar uses the Sanskrit word "paksha", meaning one half of a lunar month, which is between 14 and 15 solar days.

• In Romance languages there are the terms quincena (or quince días) in Galician and Spanish, quinzena in Catalan and Portuguese, quindicina in Italian, quinze jours or quinzaine in French, and chenzinǎ in Romanian, all meaning "15 days"; there are also the terms bisettimanale in Italian, bisemanal in Spanish, bissemanal in Portuguese, bisetmanal in Catalan, bihebdomadaire in French, and bisǎptǎmânal in Romanian, that literally mean "biweekly".

• Semitic languages have a special "doubling suffix"; when added at the end of the word for "week", which changes the meaning to "two weeks". In Hebrew, the single-word שבועיים (shvu′ayim) means exactly "two weeks". Also in Arabic, by adding the common dual suffix to the word for "week", أسبوع, the form أسبوعين (usbu′ayn), meaning "two weeks", is formed.

• Slavic languages: in Czech the terms čtrnáctidenní and dvoutýdenní have the same meaning as "fortnight".

See also

• FFF system
• Half-month
• Sennight

References

1. "Fortnight". The Concise Oxford Dictionary (5th Edition ed.). 1964. p. 480. {{cite news}}: |edition= has extra text (help)
2. Senight, sennight or se'night (seven-night), an old word for the week, was still in use in the early 19th century, to judge from Jane Austen's letters.
3. "Australian Government - How much Disability Support Pension do I get?". Archived from the original on 2008-04-16. Retrieved 2008-05-22.
4. Littmann, Mark; Fred Espenak; Ken Willcox (2008). Totality: Eclipses of the Sun. Oxford University Press. ISBN 0-19-953209-5.
5. Synodic Month definition Eric W. Weisstein

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