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Adjective: fortnightly  'fort,nIt-lee
Usage: Brit
  1. Occurring every two weeks
    - biweekly
Adverb: fortnightly  'fort,nIt-lee
Usage: Brit
  1. Every two weeks
    "he visited his cousins fortnightly";
    - biweekly

See also: periodic, periodical

Encyclopedia: Fortnightly