We found 36 dictionaries that define the word fortnight:

General (28 matching dictionaries)

1. fortnight: Merriam-Webster
2. fortnight: Oxford Learner's Dictionaries
3. fortnight: American Heritage Dictionary of the English Language
4. fortnight: Collins English Dictionary
5. fortnight: Vocabulary.com
6. Fortnight, fortnight: Wordnik
7. fortnight: Cambridge Advanced Learner's Dictionary
8. fortnight: Wiktionary
9. fortnight: Webster's New World College Dictionary, 4th Ed.
10. fortnight: The Wordsmyth English Dictionary-Thesaurus
11. fortnight: Infoplease Dictionary
12. Fortnight, fortnight: Dictionary.com
13. fortnight: Online Etymology Dictionary
14. fortnight: Cambridge Essential American English Dictionary
15. Fortnight (disambiguation), Fortnight (magazine), Fortnight (video game), Fortnight: Wikipedia, the Free Encyclopedia
16. Fortnight: Online Plain Text English Dictionary
17. fortnight: Webster's Revised Unabridged, 1913 Edition
18. fortnight: Rhymezone
19. fortnight: AllWords.com Multi-Lingual Dictionary
20. fortnight: Webster's 1828 Dictionary
21. Fortnight: Britih-American Dictionary
22. fortnight: FreeDictionary.org
23. Fortnight: The Word Detective
24. fortnight: TheFreeDictionary.com
25. fortnight: Mnemonic Dictionary
26. fortnight: Longman Dictionary of Contemporary English

Business (1 matching dictionary)

27. Travel Industry Dictionary (No longer online)

Miscellaneous (3 matching dictionaries)

28. FORTNIGHT, FORTNIGHT, FORTNIGHT: Terminology and Descriptions of Geneaological Words
29. fortnight: Genealogy Glossary
30. fortnight: Wordcraft Dictionary

Science (3 matching dictionaries)

31. Fortnight: Eric Weisstein's World of Astronomy
32. Botanical Terms (No longer online)
33. How Many? A Dictionary of Units of Measurement (No longer online)

Slang (1 matching dictionary)

34. fortnight: Urban Dictionary

(Note: See fortnights as well.)

Definitions from Wiktionary ( ) ▸ noun:  (chiefly UK, Ireland, Commonwealth, dated in North America) A period of 2 weeks. Similar: two weeks, halfmonth, week, fortnightly, sevennight, semi-weekly, millifortnight, semester, semiweekly, bimester, more... Opposite: fortnightly Phrases: Directors' Fortnight, fortnight kid, more... Adjectives: last, first, next, whole, past, bright, dark, second, full, previous, lunar ▸ Word origin ▸ Words similar to fortnight ▸ Usage examples for fortnight ▸ Idioms related to fortnight ▸ Wikipedia articles (New!) ▸ Popular adjectives describing fortnight ▸ Words that often appear near fortnight ▸ Rhymes of fortnight ▸ Invented words related to fortnight