WordReference Random House Learner's Dictionary of American English © 2015
fort•night /ˈfɔrtˌnaɪt/USA pronunciation n. [countable]

    a period of fourteen nights and days;
    two weeks.
fort•night•ly, adj., adv. 

Collins Concise English Dictionary © HarperCollins Publishers::

fortnight /ˈfɔːtˌnaɪt/ n
  1. a period of 14 consecutive days; two weeks
Etymology: Old English fēowertīene niht fourteen nights

'fortnight' also found in these entries:

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