Etymology
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fortnight (n.)

"period of two weeks," 17c. contraction of Middle English fourteniht, from Old English feowertyne niht, literally "fourteen nights" (see fourteen + night). It preserves the ancient Germanic custom of reckoning by nights (mentioned by Tacitus in "Germania" xi). Related: Fortnightly.

updated on April 27, 2017

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Definitions of fortnight from WordNet

fortnight (n.)
a period of fourteen consecutive days;
most major tennis tournaments last a fortnight
Synonyms: two weeks
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.